Borislav Petkov [Sat, 4 Apr 2015 14:40:45 +0000 (16:40 +0200)]
x86/alternatives: Document macros
Add some text to the macro magic for future reference and against
failing human memory.
Requested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
H.J. Lu [Thu, 18 Dec 2014 02:05:29 +0000 (18:05 -0800)]
x86/asm: Use -mskip-rax-setup if supported
GCC 5 added a compiler option, -mskip-rax-setup, for x86-64. It skips
setting up the RAX register when SSE is disabled and there are no
variable arguments passed in vector registers. (According to the x86_64
ABI, %al is used as a hidden register containing the number of vector
registers used).
Since the kernel doesn't pass vector registers to functions with
variable arguments, this option can be used to optimize the x86-64
kernel.
This GCC feature was suggested by Rasmus Villemoes <linux@rasmusvillemoes.dk>.
This is the corresponding kernel change using it.
For kernel v3.17:
text data bss dec filename
11455921 2204048 5853184
19513153 vmlinux #with -mskip-rax-setup
11480079 2204048 5853184
19537311 vmlinux
For Kernel v4.0+ - custom config:
text data bss dec filename
10231778 3479800
16617472 30329050 vmlinux-gcc5+-mskip-rax-setup
10268797 3547448
16621568 30437813 vmlinux
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 21 Apr 2015 16:03:14 +0000 (18:03 +0200)]
x86/asm/entry/32: Update -ENOSYS handling to match the 64-bit logic
Recently Andy changed the 64-bit syscall logic so that
pt_regs->ax is initially set to -ENOSYS, and on syscall exit,
it is updated with the actual return value. This simplified
the logic there.
This patch does the same for 32-bit syscall entry points.
The check for %rax being too big is moved to be just before
the call instruction which dispatches execution through the
syscall table.
There is no way to accidentally skip this check now by jumping
to a label after it. This allows us to remove redundant checks
after ptrace et al.
If %rax is too big, we just skip over the (call, write %rax to
pt_regs->ax) instruction pair. pt_regs->ax remains set to -ENOSYS,
and it gets returned to userspace.
Similar to 64-bit code, this eliminates the "ia32_badsys" code path.
Run-tested.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1429632194-13445-2-git-send-email-dvlasenk@redhat.com
[ Changelog massage. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 21 Apr 2015 16:03:13 +0000 (18:03 +0200)]
x86/asm/entry/64: Merge 32-bit execve stubs with x32 ones, as they are identical
Run-tested.
Suggested-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1429632194-13445-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 21 Apr 2015 16:27:29 +0000 (18:27 +0200)]
x86/asm/entry/64: Implement better check for canonical addresses
This change makes the check exact (no more false positives
on "negative" addresses).
Andy explains:
"Canonical addresses either start with 17 zeros or 17 ones.
In the old code, we checked that the top (64-47) = 17 bits were all
zero. We did this by shifting right by 47 bits and making sure that
nothing was left.
In the new code, we're shifting left by (64 - 48) = 16 bits and then
signed shifting right by the same amount, this propagating the 17th
highest bit to all positions to its left. If we get the same value we
started with, then we're good to go."
While it isn't really important to be fully correct here -
almost all addresses we'll ever see will be userspace ones,
but OTOH it looks to be cheap enough: the new code uses
two more ALU ops but preserves %rcx, allowing to not
reload it from pt_regs->cx again.
On disassembly level, the changes are:
cmp %rcx,0x80(%rsp) -> mov 0x80(%rsp),%r11; cmp %rcx,%r11
shr $0x2f,%rcx -> shl $0x10,%rcx; sar $0x10,%rcx; cmp %rcx,%r11
mov 0x58(%rsp),%rcx -> (eliminated)
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1429633649-20169-1-git-send-email-dvlasenk@redhat.com
[ Changelog massage. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Hagen Paul Pfeifer [Mon, 20 Apr 2015 21:27:11 +0000 (23:27 +0200)]
x86/asm: Always inline atomics
During some code analysis I realized that atomic_add(), atomic_sub()
and friends are not necessarily inlined AND that each function
is defined multiple times:
atomic_inc: 544 duplicates
atomic_dec: 215 duplicates
atomic_dec_and_test: 107 duplicates
atomic64_inc: 38 duplicates
[...]
Each definition is exact equally, e.g.:
ffffffff813171b8 <atomic_add>:
55 push %rbp
48 89 e5 mov %rsp,%rbp
f0 01 3e lock add %edi,(%rsi)
5d pop %rbp
c3 retq
In turn each definition has one or more callsites (sure):
ffffffff81317c78: e8 3b f5 ff ff callq
ffffffff813171b8 <atomic_add> [...]
ffffffff8131a062: e8 51 d1 ff ff callq
ffffffff813171b8 <atomic_add> [...]
ffffffff8131a190: e8 23 d0 ff ff callq
ffffffff813171b8 <atomic_add> [...]
The other way around would be to remove the static linkage - but
I prefer an enforced inlining here.
Before:
text data bss dec hex filename
81467393 19874720 20168704 121510817 73e1ba1 vmlinux.orig
After:
text data bss dec hex filename
81461323 19874720 20168704 121504747 73e03eb vmlinux.inlined
Yes, the inlining here makes the kernel even smaller! ;)
Linus further observed:
"I have this memory of having seen that before - the size
heuristics for gcc getting confused by inlining.
[...]
It might be a good idea to mark things that are basically just
wrappers around a single (or a couple of) asm instruction to be
always_inline."
Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1429565231-4609-1-git-send-email-hagen@jauu.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Andy Lutomirski [Fri, 3 Apr 2015 22:51:54 +0000 (15:51 -0700)]
x86, paravirt, xen: Remove the 64-bit ->irq_enable_sysexit() pvop
We don't use irq_enable_sysexit on 64-bit kernels any more.
Remove all the paravirt and Xen machinery to support it on
64-bit kernels.
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/8a03355698fe5b94194e9e7360f19f91c1b2cf1f.1428100853.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Chris Wilson [Wed, 15 Apr 2015 09:51:26 +0000 (10:51 +0100)]
x86/asm: Enable fast 32-bit put_user_64() for copy_to_user()
For fixed sized copies, copy_to_user() will utilize
__put_user_size() fastpaths. However, it is missing the
translation for 64-bit copies on x86/32.
Testing on a Pinetrail Atom, the 64 bit put_user() fastpath
is substantially faster than the generic copy_to_user()
fallback.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: intel-gfx@lists.freedesktop.org
Link: http://lkml.kernel.org/r/1429091486-11443-1-git-send-email-chris@chris-wilson.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Borislav Petkov [Wed, 15 Apr 2015 06:50:14 +0000 (08:50 +0200)]
x86/asm, x86/acpi/wakeup_64.S: Make global label a local one
Make it a local symbol so that it doesn't appear in objdump
output.
No functionality change - code remains the same, just the global
label disappears:
ffffffff81039dbe: bf 03 00 00 00 mov $0x3,%edi
ffffffff81039dc3: 31 c0 xor %eax,%eax
ffffffff81039dc5: e8 b6 fd ff ff callq
ffffffff81039b80 <x86_acpi_enter_sleep_state>
-
ffffffff81039dca: eb 00 jmp
ffffffff81039dcc <resume_point>
-
-
ffffffff81039dcc <resume_point>:
+
ffffffff81039dca: eb 00 jmp
ffffffff81039dcc <do_suspend_lowlevel+0x9c>
ffffffff81039dcc: 48 c7 c0 80 1a ca 82 mov $0xffffffff82ca1a80,%rax
ffffffff81039dd3: 48 8b 98 e2 00 00 00 mov 0xe2(%rax),%rbx
ffffffff81039dda: 0f 22 e3 mov %rbx,%cr4
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <linux-pm@vger.kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1429080614-22610-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Borislav Petkov [Sun, 12 Apr 2015 19:45:06 +0000 (21:45 +0200)]
x86/asm, x86/power/hibernate: Use local labels in asm
... so that they don't appear in the object file and thus in
objdump output. They're local anyway and have a meaning only
within that file.
No functionality change.
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-pm@vger.kernel.org
Link: http://lkml.kernel.org/r/1428867906-12016-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Brian Gerst [Sun, 12 Apr 2015 13:14:46 +0000 (09:14 -0400)]
x86/asm: Remove unused TI_cpu
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Link: http://lkml.kernel.org/r/1428844486-6638-2-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Brian Gerst [Sun, 12 Apr 2015 13:14:45 +0000 (09:14 -0400)]
x86/asm: Merge common 32-bit values in asm-offsets.c
Merge common values for 32-bit native and compat.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Link: http://lkml.kernel.org/r/1428844486-6638-1-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linus Torvalds [Mon, 13 Apr 2015 20:36:45 +0000 (13:36 -0700)]
Merge branch 'x86-vdso-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 vdso changes from Ingo Molnar:
"Misc vDSO updates"
* 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/vdso: Remove x32 intermediates during 'make clean'
x86/vdso: Teach 'make clean' to remove generated vdso-image-*.c files
x86/vdso32/syscall.S: Do not load __USER32_DS to %ss
x86/vdso: Fix the x86 vdso2c tool includes
Linus Torvalds [Mon, 13 Apr 2015 20:34:46 +0000 (13:34 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 fix from Ingo Molnar:
"Leftover from 4.0
Fix a local stack variable corruption with certain kdump usage
patterns (Dave Young)"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mm/numa: Fix kernel stack corruption in numa_init()->numa_clear_kernel_node_hotplug()
Linus Torvalds [Mon, 13 Apr 2015 20:33:20 +0000 (13:33 -0700)]
Merge branch 'x86-ras-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 RAS changes from Ingo Molnar:
"The main changes in this cycle were:
- Simplify the CMCI storm logic on Intel CPUs after yet another
report about a race in the code (Borislav Petkov)
- Enable the MCE threshold irq on AMD CPUs by default (Aravind
Gopalakrishnan)
- Add AMD-specific MCE-severity grading function. Further error
recovery actions will be based on its output (Aravind Gopalakrishnan)
- Documentation updates (Borislav Petkov)
- ... assorted fixes and cleanups"
* 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mce/severity: Fix warning about indented braces
x86/mce: Define mce_severity function pointer
x86/mce: Add an AMD severities-grading function
x86/mce: Reindent __mcheck_cpu_apply_quirks() properly
x86/mce: Use safe MSR accesses for AMD quirk
x86/MCE/AMD: Enable thresholding interrupts by default if supported
x86/MCE: Make mce_panic() fatal machine check msg in the same pattern
x86/MCE/intel: Cleanup CMCI storm logic
Documentation/acpi/einj: Correct and streamline text
x86/MCE/AMD: Drop bogus const modifier from AMD's bank4_names()
Linus Torvalds [Mon, 13 Apr 2015 20:32:35 +0000 (13:32 -0700)]
Merge branch 'x86-platform-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 platform change from Ingo Molnar:
"An Intel Quark SoC fix"
* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/intel/quark: Run IMR self-test on IMR capble hw only
Linus Torvalds [Mon, 13 Apr 2015 20:31:32 +0000 (12:31 -0800)]
Merge branch 'x86-mm-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 mm changes from Ingo Molnar:
"The main changes in this cycle were:
- reduce the x86/32 PAE per task PGD allocation overhead from 4K to
0.032k (Fenghua Yu)
- early_ioremap/memunmap() usage cleanups (Juergen Gross)
- gbpages support cleanups (Luis R Rodriguez)
- improve AMD Bulldozer (family 0x15) ASLR I$ aliasing workaround to
increase randomization by 3 bits (per bootup) (Hector
Marco-Gisbert)
- misc fixlets"
* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mm: Improve AMD Bulldozer ASLR workaround
x86/mm/pat: Initialize __cachemode2pte_tbl[] and __pte2cachemode_tbl[] in a bit more readable fashion
init.h: Clean up the __setup()/early_param() macros
x86/mm: Simplify probe_page_size_mask()
x86/mm: Further simplify 1 GB kernel linear mappings handling
x86/mm: Use early_param_on_off() for direct_gbpages
init.h: Add early_param_on_off()
x86/mm: Simplify enabling direct_gbpages
x86/mm: Use IS_ENABLED() for direct_gbpages
x86/mm: Unexport set_memory_ro() and set_memory_rw()
x86/mm, efi: Use early_ioremap() in arch/x86/platform/efi/efi-bgrt.c
x86/mm: Use early_memunmap() instead of early_iounmap()
x86/mm/pat: Ensure different messages in STRICT_DEVMEM and PAT cases
x86/mm: Reduce PAE-mode per task pgd allocation overhead from 4K to 32 bytes
Linus Torvalds [Mon, 13 Apr 2015 20:25:33 +0000 (13:25 -0700)]
Merge branch 'x86-microcode-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 microcode changes from Ingo Molnar:
"Microcode driver updates: mostly cleanups but also some fixes
(Borislav Petkov)"
* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/microcode/amd: Drop the pci_ids.h dependency
x86/microcode/intel: Fix printing of microcode blobs in show_saved_mc()
x86/microcode/intel: Check scan_microcode()'s retval
x86/microcode/intel: Sanitize microcode_pointer()
x86/microcode/intel: Move mc arg last in get_matching_{microcode|sig}
x86/microcode/intel: Simplify generic_load_microcode_early()
x86/microcode: Consolidate family,model, ... code
x86/microcode/intel: Rename update_match_revision()
x86/microcode/intel: Sanitize _save_mc()
x86/microcode/intel: Make _save_mc() return the updated saved count
x86/microcode/intel: Simplify load_ucode_intel_bsp()
x86/microcode/intel: Get rid of last arg to load_ucode_intel_bsp()
x86/microcode/intel: Do the mc_saved_src NULL check first
x86/microcode/intel: Check if microcode was found before applying
x86/microcode/intel: Fix out of bounds memory access to the extended header
Linus Torvalds [Mon, 13 Apr 2015 20:24:23 +0000 (13:24 -0700)]
Merge branch 'x86-fpu-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 fpu changes from Ingo Molnar:
"Various x86 FPU handling cleanups, refactorings and fixes (Borislav
Petkov, Oleg Nesterov, Rik van Riel)"
* 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits)
x86/fpu: Kill eager_fpu_init_bp()
x86/fpu: Don't allocate fpu->state for swapper/0
x86/fpu: Rename drop_init_fpu() to fpu_reset_state()
x86/fpu: Fold __drop_fpu() into its sole user
x86/fpu: Don't abuse drop_init_fpu() in flush_thread()
x86/fpu: Use restore_init_xstate() instead of math_state_restore() on kthread exec
x86/fpu: Introduce restore_init_xstate()
x86/fpu: Document user_fpu_begin()
x86/fpu: Factor out memset(xstate, 0) in fpu_finit() paths
x86/fpu: Change xstateregs_get()/set() to use ->xsave.i387 rather than ->fxsave
x86/fpu: Don't abuse FPU in kernel threads if use_eager_fpu()
x86/fpu: Always allow FPU in interrupt if use_eager_fpu()
x86/fpu: __kernel_fpu_begin() should clear fpu_owner_task even if use_eager_fpu()
x86/fpu: Also check fpu_lazy_restore() when use_eager_fpu()
x86/fpu: Use task_disable_lazy_fpu_restore() helper
x86/fpu: Use an explicit if/else in switch_fpu_prepare()
x86/fpu: Introduce task_disable_lazy_fpu_restore() helper
x86/fpu: Move lazy restore functions up a few lines
x86/fpu: Change math_error() to use unlazy_fpu(), kill (now) unused save_init_fpu()
x86/fpu: Don't do __thread_fpu_end() if use_eager_fpu()
...
Linus Torvalds [Mon, 13 Apr 2015 20:23:34 +0000 (13:23 -0700)]
Merge branch 'x86-debug-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 debug changes from Ingo Molnar:
"Stack printing fixlets"
* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/kernel: Use kstack_end() in dumpstack_64.c
x86/kernel: Fix output of show_stack_log_lvl()
Linus Torvalds [Mon, 13 Apr 2015 20:21:51 +0000 (13:21 -0700)]
Merge branch 'x86-cpu-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 cacheinfo sysfs changes from Ingo Molnar:
"This tree converts the x86 cacheinfo sysfs code to use the generic
code in drivers/base/cacheinfo.c.
It's not intended to change the sysfs ABI:
'This patch neither alters any existing sysfs entries nor their
formating, however since the generic cacheinfo has switched to
use the device attributes instead of the traditional raw
kobjects, a directory named 'power' along with its standard
attributes are added similar to any other device'"
* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/cpu/cacheinfo: Fix cache_get_priv_group() for Intel processors
x86/cacheinfo: Move cacheinfo sysfs code to generic infrastructure
Linus Torvalds [Mon, 13 Apr 2015 20:20:54 +0000 (13:20 -0700)]
Merge branch 'x86-cleanups-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 cleanups from Ingo Molnar:
"Various cleanups"
* 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/iommu: Fix header comments regarding standard and _FINISH macros
x86/earlyprintk: Put CONFIG_PCI-only functions under the #ifdef
x86: Fix up obsolete __cpu_set() function usage
Linus Torvalds [Mon, 13 Apr 2015 20:19:59 +0000 (13:19 -0700)]
Merge branch 'x86-build-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 build changes from Ingo Molnar:
"Small cleanups and fixes"
* 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/kexec: Cleanup KEXEC_VERIFY_SIG Kconfig help text
x86/build/defconfig: Enable USB_EHCI_TT_NEWSCHED=y
x86/build: Fix mkcapflags.sh bash-ism
x86/Kconfig: Simplify X86_UP_APIC handling
x86/Kconfig: Simplify X86_IO_APIC dependencies
x86/Kconfig: Avoid issuing pointless turned off entries to .config
Linus Torvalds [Mon, 13 Apr 2015 20:19:10 +0000 (13:19 -0700)]
Merge branch 'x86-boot-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 boot changes from Ingo Molnar:
"A number of cleanups"
* 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/boot: Standardize strcmp()
x86/boot/64: Remove pointless early_printk() message
x86/boot/video: Move the 'video_segment' variable to video.c
Linus Torvalds [Mon, 13 Apr 2015 20:16:36 +0000 (13:16 -0700)]
Merge branch 'x86-asm-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 asm changes from Ingo Molnar:
"There were lots of changes in this development cycle:
- over 100 separate cleanups, restructuring changes, speedups and
fixes in the x86 system call, irq, trap and other entry code, part
of a heroic effort to deobfuscate a decade old spaghetti asm code
and its C code dependencies (Denys Vlasenko, Andy Lutomirski)
- alternatives code fixes and enhancements (Borislav Petkov)
- simplifications and cleanups to the compat code (Brian Gerst)
- signal handling fixes and new x86 testcases (Andy Lutomirski)
- various other fixes and cleanups
By their nature many of these changes are risky - we tried to test
them well on many different x86 systems (there are no known
regressions), and they are split up finely to help bisection - but
there's still a fair bit of residual risk left so caveat emptor"
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (148 commits)
perf/x86/64: Report regs_user->ax too in get_regs_user()
perf/x86/64: Simplify regs_user->abi setting code in get_regs_user()
perf/x86/64: Do report user_regs->cx while we are in syscall, in get_regs_user()
perf/x86/64: Do not guess user_regs->cs, ss, sp in get_regs_user()
x86/asm/entry/32: Tidy up JNZ instructions after TESTs
x86/asm/entry/64: Reduce padding in execve stubs
x86/asm/entry/64: Remove GET_THREAD_INFO() in ret_from_fork
x86/asm/entry/64: Simplify jumps in ret_from_fork
x86/asm/entry/64: Remove a redundant jump
x86/asm/entry/64: Optimize [v]fork/clone stubs
x86/asm/entry: Zero EXTRA_REGS for stub32_execve() too
x86/asm/entry/64: Move stub_x32_execvecloser() to stub_execveat()
x86/asm/entry/64: Use common code for rt_sigreturn() epilogue
x86/asm/entry/64: Add forgotten CFI annotation
x86/asm/entry/irq: Simplify interrupt dispatch table (IDT) layout
x86/asm/entry/64: Move opportunistic sysret code to syscall code path
x86, selftests: Add sigreturn selftest
x86/alternatives: Guard NOPs optimization
x86/asm/entry: Clear EXTRA_REGS for all executable formats
x86/signal: Remove pax argument from restore_sigcontext
...
Linus Torvalds [Mon, 13 Apr 2015 20:15:09 +0000 (13:15 -0700)]
Merge branch 'x86-apic-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 apic changes from Ingo Molnar:
"Changes:
- SGI UV APIC driver updates
- dead code removal"
* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/apic/uv: Update the UV APIC HUB check
x86/apic/uv: Update the UV APIC driver check
x86/apic/uv: Update the APIC UV OEM check
x86/apic: Remove verify_local_APIC()
Linus Torvalds [Mon, 13 Apr 2015 18:08:28 +0000 (11:08 -0700)]
Merge branch 'timers-core-for-linus' of git://git./linux/kernel/git/tip/tip
Pull timer updates from Ingo Molnar:
"The main changes in this cycle were:
- clockevents state machine cleanups and enhancements (Viresh Kumar)
- clockevents broadcast notifier horror to state machine conversion
and related cleanups (Thomas Gleixner, Rafael J Wysocki)
- clocksource and timekeeping core updates (John Stultz)
- clocksource driver updates and fixes (Ben Dooks, Dmitry Osipenko,
Hans de Goede, Laurent Pinchart, Maxime Ripard, Xunlei Pang)
- y2038 fixes (Xunlei Pang, John Stultz)
- NMI-safe ktime_get_raw_fast() and general refactoring of the clock
code, in preparation to perf's per event clock ID support (Peter
Zijlstra)
- generic sched/clock fixes, optimizations and cleanups (Daniel
Thompson)
- clockevents cpu_down() race fix (Preeti U Murthy)"
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (94 commits)
timers/PM: Drop unnecessary braces from tick_freeze()
timers/PM: Fix up tick_unfreeze()
timekeeping: Get rid of stale comment
clockevents: Cleanup dead cpu explicitely
clockevents: Make tick handover explicit
clockevents: Remove broadcast oneshot control leftovers
sched/idle: Use explicit broadcast oneshot control function
ARM: Tegra: Use explicit broadcast oneshot control function
ARM: OMAP: Use explicit broadcast oneshot control function
intel_idle: Use explicit broadcast oneshot control function
ACPI/idle: Use explicit broadcast control function
ACPI/PAD: Use explicit broadcast oneshot control function
x86/amd/idle, clockevents: Use explicit broadcast oneshot control functions
clockevents: Provide explicit broadcast oneshot control functions
clockevents: Remove the broadcast control leftovers
ARM: OMAP: Use explicit broadcast control function
intel_idle: Use explicit broadcast control function
cpuidle: Use explicit broadcast control function
ACPI/processor: Use explicit broadcast control function
ACPI/PAD: Use explicit broadcast control function
...
Linus Torvalds [Mon, 13 Apr 2015 17:47:34 +0000 (10:47 -0700)]
Merge branch 'sched-core-for-linus' of git://git./linux/kernel/git/tip/tip
Pull scheduler changes from Ingo Molnar:
"Major changes:
- Reworked CPU capacity code, for better SMP load balancing on
systems with assymetric CPUs. (Vincent Guittot, Morten Rasmussen)
- Reworked RT task SMP balancing to be push based instead of pull
based, to reduce latencies on large CPU count systems. (Steven
Rostedt)
- SCHED_DEADLINE support updates and fixes. (Juri Lelli)
- SCHED_DEADLINE task migration support during CPU hotplug. (Wanpeng Li)
- x86 mwait-idle optimizations and fixes. (Mike Galbraith, Len Brown)
- sched/numa improvements. (Rik van Riel)
- various cleanups"
* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (28 commits)
sched/core: Drop debugging leftover trace_printk call
sched/deadline: Support DL task migration during CPU hotplug
sched/core: Check for available DL bandwidth in cpuset_cpu_inactive()
sched/deadline: Always enqueue on previous rq when dl_task_timer() fires
sched/core: Remove unused argument from init_[rt|dl]_rq()
sched/deadline: Fix rt runtime corruption when dl fails its global constraints
sched/deadline: Avoid a superfluous check
sched: Improve load balancing in the presence of idle CPUs
sched: Optimize freq invariant accounting
sched: Move CFS tasks to CPUs with higher capacity
sched: Add SD_PREFER_SIBLING for SMT level
sched: Remove unused struct sched_group_capacity::capacity_orig
sched: Replace capacity_factor by usage
sched: Calculate CPU's usage statistic and put it into struct sg_lb_stats::group_usage
sched: Add struct rq::cpu_capacity_orig
sched: Make scale_rt invariant with frequency
sched: Make sched entity usage tracking scale-invariant
sched: Remove frequency scaling from cpu_capacity
sched: Track group sched_entity usage contributions
sched: Add sched_avg::utilization_avg_contrib
...
Linus Torvalds [Mon, 13 Apr 2015 17:27:28 +0000 (10:27 -0700)]
Merge branch 'locking-core-for-linus' of git://git./linux/kernel/git/tip/tip
Pull core locking changes from Ingo Molnar:
"Main changes:
- jump label asm preparatory work for PowerPC (Anton Blanchard)
- rwsem optimizations and cleanups (Davidlohr Bueso)
- mutex optimizations and cleanups (Jason Low)
- futex fix (Oleg Nesterov)
- remove broken atomicity checks from {READ,WRITE}_ONCE() (Peter
Zijlstra)"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
powerpc, jump_label: Include linux/jump_label.h to get HAVE_JUMP_LABEL define
jump_label: Allow jump labels to be used in assembly
jump_label: Allow asm/jump_label.h to be included in assembly
locking/mutex: Further simplify mutex_spin_on_owner()
locking: Remove atomicy checks from {READ,WRITE}_ONCE
locking/rtmutex: Rename argument in the rt_mutex_adjust_prio_chain() documentation as well
locking/rwsem: Fix lock optimistic spinning when owner is not running
locking: Remove ACCESS_ONCE() usage
locking/rwsem: Check for active lock before bailing on spinning
locking/rwsem: Avoid deceiving lock spinners
locking/rwsem: Set lock ownership ASAP
locking/rwsem: Document barrier need when waking tasks
locking/futex: Check PF_KTHREAD rather than !p->mm to filter out kthreads
locking/mutex: Refactor mutex_spin_on_owner()
locking/mutex: In mutex_spin_on_owner(), return true when owner changes
Linus Torvalds [Mon, 13 Apr 2015 17:22:30 +0000 (10:22 -0700)]
Merge branch 'core-efi-for-linus' of git://git./linux/kernel/git/tip/tip
Pull EFI update from Ingo Molnar:
"This tree includes various fixes, cleanups, a new efi=debug boot
option and EFI boot stub memory allocation optimizations"
* 'core-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
efi/libstub: Retrieve FDT size when loaded from UEFI config table
efi: Clean up the efi_call_phys_[prolog|epilog]() save/restore interaction
efi: Disable interrupts around EFI calls, not in the epilog/prolog calls
x86/efi: Add a "debug" option to the efi= cmdline
firmware: dmi_scan: Use direct access to static vars
firmware: dmi_scan: Use full dmi version for SMBIOS3
Linus Torvalds [Mon, 13 Apr 2015 17:11:18 +0000 (10:11 -0700)]
Merge tag 'md/4.0-rc7-fix' of git://neil.brown.name/md
Pull md fixes from Neil Brown:
"Two regression fixes for md, one fairly recent and minor (diskstats
has confusing data) and one older and more serious - RAID0 with
non-power-of-2 chunksize corrupts data.
I guess (almost) no-one uses non-power-of-2 chunks.
Summary:
- Revert recent change which broke IO accounting.
- Fix bug with RAID0 arrays with non-power-of-2 chunk size"
* tag 'md/4.0-rc7-fix' of git://neil.brown.name/md:
md/raid0: fix bug with chunksize not a power of 2.
md: fix md io stats accounting broken
Linus Torvalds [Mon, 13 Apr 2015 16:47:01 +0000 (09:47 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm
Pull KVM updates from Paolo Bonzini:
"First batch of KVM changes for 4.1
The most interesting bit here is irqfd/ioeventfd support for ARM and
ARM64.
Summary:
ARM/ARM64:
fixes for live migration, irqfd and ioeventfd support (enabling
vhost, too), page aging
s390:
interrupt handling rework, allowing to inject all local interrupts
via new ioctl and to get/set the full local irq state for migration
and introspection. New ioctls to access memory by virtual address,
and to get/set the guest storage keys. SIMD support.
MIPS:
FPU and MIPS SIMD Architecture (MSA) support. Includes some
patches from Ralf Baechle's MIPS tree.
x86:
bugfixes (notably for pvclock, the others are small) and cleanups.
Another small latency improvement for the TSC deadline timer"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (146 commits)
KVM: use slowpath for cross page cached accesses
kvm: mmu: lazy collapse small sptes into large sptes
KVM: x86: Clear CR2 on VCPU reset
KVM: x86: DR0-DR3 are not clear on reset
KVM: x86: BSP in MSR_IA32_APICBASE is writable
KVM: x86: simplify kvm_apic_map
KVM: x86: avoid logical_map when it is invalid
KVM: x86: fix mixed APIC mode broadcast
KVM: x86: use MDA for interrupt matching
kvm/ppc/mpic: drop unused IRQ_testbit
KVM: nVMX: remove unnecessary double caching of MAXPHYADDR
KVM: nVMX: checks for address bits beyond MAXPHYADDR on VM-entry
KVM: x86: cache maxphyaddr CPUID leaf in struct kvm_vcpu
KVM: vmx: pass error code with internal error #2
x86: vdso: fix pvclock races with task migration
KVM: remove kvm_read_hva and kvm_read_hva_atomic
KVM: x86: optimize delivery of TSC deadline timer interrupt
KVM: x86: extract blocking logic from __vcpu_run
kvm: x86: fix x86 eflags fixed bit
KVM: s390: migrate vcpu interrupt state
...
Linus Torvalds [Mon, 13 Apr 2015 15:59:21 +0000 (08:59 -0700)]
Merge tag 'linux-kselftest-4.1-rc1' of git://git./linux/kernel/git/shuah/linux-kselftest
Pull kselftest updates from Shuah Khan:
"This is a milestone update in a sense. Several new tests and install
and packaging support is added in this update.
This update adds install and packaging tools developed on top of
back-end shared logic enhancemnets to run and install tests. In
addition several timer tests are added.
- New timer tests from John Stultz
- rtc test from Prarit Bhargava
- Enhancements to un and install tests from Michael Ellerman
- Install and packaging tools from Shuah Khan
- Cross-compilation enablement from Tyler Baker
- A couple of bug fixes"
* tag 'linux-kselftest-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (42 commits)
ftracetest: Do not use usleep directly
selftest/mqueue: enable cross compilation
selftest/ipc: enable cross compilation
selftest/memfd: include default header install path
selftest/mount: enable cross compilation
selftest/memfd: enable cross compilation
kselftests: timers: Make set-timer-lat fail more gracefully for !CAP_WAKE_ALARM
selftests: Change memory on-off-test.sh name to be unique
selftests: change cpu on-off-test.sh name to be unique
selftests/mount: Make git ignore all binaries in mount test suite
kselftests: timers: Reduce default runtime on inconsistency-check and set-timer-lat
ftracetest: Convert exit -1 to exit $FAIL
ftracetest: Cope properly with stack tracer not being enabled
tools, update rtctest.c to verify passage of time
Documentation, split up rtc.txt into documentation and test file
selftests: Add tool to generate kselftest tar archive
selftests: Add kselftest install tool
selftests: Set CC using CROSS_COMPILE once in lib.mk
selftests: Add install support for the powerpc tests
selftests/timers: Use shared logic to run and install tests
...
Linus Torvalds [Sun, 12 Apr 2015 22:12:50 +0000 (15:12 -0700)]
Linux 4.0
Linus Torvalds [Sun, 12 Apr 2015 17:56:12 +0000 (10:56 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs
Pull vfs and fs fixes from Al Viro:
"Several AIO and OCFS2 fixes"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
ocfs2: _really_ sync the right range
ocfs2_file_write_iter: keep return value and current position update in sync
[regression] ocfs2: do *not* increment ->ki_pos twice
ioctx_alloc(): fix vma (and file) leak on failure
fix mremap() vs. ioctx_kill() race
Linus Torvalds [Sun, 12 Apr 2015 17:43:30 +0000 (10:43 -0700)]
Merge branch 'fixes' of git://git./linux/kernel/git/evalenti/linux-soc-thermal
Pull last minute thermal-SoC management fixes from Eduardo Valentin:
"Specifics:
- Minor fixes on ST and RCAR thermal drivers.
- Avoid flooding kernel log when driver returns -EAGAIN.
Note: I am sending this pull on Rui's behalf while he fixes issues in
his Linux box"
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal:
drivers: thermal: st: remove several sparse warnings
thermal: constify of_device_id array
thermal: Do not log an error if thermal_zone_get_temp returns -EAGAIN
thermal: rcar: Fix typo in r8a73a4 SoC name
Linus Torvalds [Sat, 11 Apr 2015 22:57:36 +0000 (15:57 -0700)]
Merge tag 'asoc-fix-v4.0-rc7' of git://git./linux/kernel/git/broonie/sound
Pull last-minute ASoC fix from Mark Brown:
"This patch backs out a change that came in during the merge window
which selects a configuration for GPIO4 on pcm512x CODECs that may not
be suitable for all systems using the device. Changes for v4.1 will
make this properly configurable but for now it's safest to revert to
the v3.19 behaviour and leave the pin configuration alone.
Sorry for sending this direct at the last minute but due to the GPIO
misuse it'd be really good to get it in the release and I'd not
realised it hadn't been sent yet - between some travel, a job change
and other non-urgent fixes coming in I'd lost track of the urgency.
It's been in -next for several weeks now, is isolated to the driver
and fairly clear to inspection"
* tag 'asoc-fix-v4.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound:
ASoC: pcm512x: Remove hardcoding of pll-lock to GPIO4
Howard Mitchell [Mon, 23 Mar 2015 21:17:01 +0000 (21:17 +0000)]
ASoC: pcm512x: Remove hardcoding of pll-lock to GPIO4
Currently GPIO4 is hardcoded to output the pll-lock signal.
Unfortunately this is after the pll-out GPIO is configured which
is selectable in the device tree. Therefore it is not possible to
use GPIO4 for pll-out. Therefore this patch removes the
configuration of GPIO4.
Signed-off-by: Howard Mitchell <hm@hmbedded.co.uk>
Signed-off-by: Mark Brown <broonie@kernel.org>
Linus Torvalds [Sat, 11 Apr 2015 20:46:07 +0000 (13:46 -0700)]
Revert "dmaengine: Add a warning for drivers not using the generic slave caps retrieval"
This reverts commit
ecc19d17868be9c9f8f00ed928791533c420f3e0.
It added a new warning to try to encourage driver writers to set the
device capabities properly, but drivers haven't been updated and in the
meantime it just generaters a scary message that users cannot actually
do anything about.
Warnings like these are appropriate if you actually expect to fix the
code that causes them. They are not appropriate for releases.
Requested-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Thu, 9 Apr 2015 21:12:22 +0000 (14:12 -0700)]
blk-mq: initialize 'struct request' and associated data to zero
Jan Engelhardt reports a strange oops with an invalid ->sense_buffer
pointer in scsi_init_cmd_errh() with the blk-mq code.
The sense_buffer pointer should have been initialized by the call to
scsi_init_request() from blk_mq_init_rq_map(), but there seems to be
some non-repeatable memory corruptor.
This patch makes sure we initialize the whole struct request allocation
(and the associated 'struct scsi_cmnd' for the SCSI case) to zero, by
using __GFP_ZERO in the allocation. The old code initialized a couple
of individual fields, leaving the rest undefined (although many of them
are then initialized in later phases, like blk_mq_rq_ctx_init() etc.
It's not entirely clear why this matters, but it's the rigth thing to do
regardless, and with 4.0 imminent this is the defensive "let's just make
sure everything is initialized properly" patch.
Tested-by: Jan Engelhardt <jengelh@inai.de>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Sat, 11 Apr 2015 17:52:13 +0000 (10:52 -0700)]
Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma
Pull dmaengine fix from Vinod Koul:
"I have one more fix to fix the boot warning on cppi driver due to
missing capabilities"
* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
dmaengine: cppi41: add missing bitfields
Linus Torvalds [Sat, 11 Apr 2015 17:47:17 +0000 (10:47 -0700)]
Merge tag 'for-linus-4.0-1' of git://git.code.sf.net/p/openipmi/linux-ipmi
Pull late ipmi fixes from Corey Minyard:
"Some annoying issues in the IPMI driver that would be good to have
fixed before 4.0 is released.
These got reported or discovered late, but they will avoid some
situations that would cause lots of log spam and in one case a
deadlock"
* tag 'for-linus-4.0-1' of git://git.code.sf.net/p/openipmi/linux-ipmi:
ipmi_ssif: Use interruptible completion for waiting in the thread
ipmi/powernv: Fix minor locking bug
ipmi: Handle BMCs that don't allow clearing the rcv irq bit
Felipe Balbi [Wed, 8 Apr 2015 16:45:42 +0000 (11:45 -0500)]
dmaengine: cppi41: add missing bitfields
Add missing directions, residue_granularity,
srd_addr_widths and dst_addr_widths bitfields.
Without those we will see a kernel WARN()
when loading musb on am335x devices.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Denys Vlasenko [Fri, 10 Apr 2015 13:06:59 +0000 (15:06 +0200)]
perf/x86/64: Report regs_user->ax too in get_regs_user()
I don't see why we report e.g. orix_ax, which is not always
meaningful, but don't report ax, which is meaningful.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1428671219-29341-4-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Fri, 10 Apr 2015 13:06:58 +0000 (15:06 +0200)]
perf/x86/64: Simplify regs_user->abi setting code in get_regs_user()
user_64bit_mode(regs) basically checks regs->cs to point to a
64-bit segment. This check used to be unreliable here because
regs->cs was not always correct in syscalls.
Now regs->cs is always correct: in syscalls, in interrupts, in
exceptions. No need to emply heuristics here.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1428671219-29341-3-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Fri, 10 Apr 2015 13:06:57 +0000 (15:06 +0200)]
perf/x86/64: Do report user_regs->cx while we are in syscall, in get_regs_user()
Yes, it is true that cx contains return address.
It's not clear why we trash it.
Stop doing that.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1428671219-29341-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Fri, 10 Apr 2015 13:06:56 +0000 (15:06 +0200)]
perf/x86/64: Do not guess user_regs->cs, ss, sp in get_regs_user()
After recent changes to syscall entry points,
user_regs->{cs,ss,sp} are always correct. (They used to be
undefined while in syscalls).
We can report them reliably, without guessing.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1428671219-29341-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Fri, 10 Apr 2015 18:13:40 +0000 (20:13 +0200)]
x86/asm/entry/32: Tidy up JNZ instructions after TESTs
After TESTs, use logically correct JNZ mnemonic instead of JNE.
This doesn't change code:
md5:
c3005b39a11fe582b7df7908561ad4ee entry_32.o.before.asm
c3005b39a11fe582b7df7908561ad4ee entry_32.o.after.asm
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428689620-21881-1-git-send-email-dvlasenk@redhat.com
[ Added object file comparison. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Corey Minyard [Sat, 4 Apr 2015 06:54:26 +0000 (01:54 -0500)]
ipmi_ssif: Use interruptible completion for waiting in the thread
The code was using an normal completion, but that caused stuck
task errors after a while. Use an interruptible one to avoid that.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Alistair Popple [Fri, 10 Apr 2015 07:32:20 +0000 (17:32 +1000)]
ipmi/powernv: Fix minor locking bug
If ipmi_powernv_recv(...) is called without a current message it
prints a warning and returns. However it fails to release the message
lock causing the system to dead lock during any subsequent IPMI
operations.
This error path should never normally be taken unless there are bugs
elsewhere in the system.
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Corey Minyard [Fri, 3 Apr 2015 17:13:48 +0000 (12:13 -0500)]
ipmi: Handle BMCs that don't allow clearing the rcv irq bit
Some BMCs don't let you clear the receive irq bit in the global
enables. This is kind of silly, but they give an error if you
try to clear it. Compensate for this by detecting the situation
and working around it.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Tested-by: Thomas D <whissi@whissi.de>
Reviewed-by: Thomas D <whissi@whissi.de>
Linus Torvalds [Sat, 11 Apr 2015 00:41:47 +0000 (17:41 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"This is our remaining set of three fixes for 4.0: two oops fixes(one
for cable pulls triggering oopses and the other be2iscsi specific) and
one warn on in sysfs on multipath devices using enclosures"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
Defer processing of REQ_PREEMPT requests for blocked devices
be2iscsi: Fix kernel panic when device initialization fails
enclosure: fix WARN_ON removing an adapter in multi-path devices
Linus Torvalds [Fri, 10 Apr 2015 23:56:40 +0000 (16:56 -0700)]
Merge git://git./linux/kernel/git/nab/target-pending
Pull SCSI target fixes from Nicholas Bellinger:
"Just a few small fixes:
Two from Andy, the first addresses a v4.0 target specific regression
to a user visible configfs attribute, and the second adds a set of
missing brackets around IPv6 discovery portal information within
iscsi-target.
And one from Mike that fixes an OOPs regression in traditional
iscsi-target when an iovec allocation fails, that has been present
since v3.10.y code. (CC'd to stable)"
* git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
iscsi target: fix oops when adding reject pdu
iscsi-target: TargetAddress in SendTargets should bracket ipv6 addresses
target: Allow userspace to write 1 to attrib/emulate_fua_write
Mike Christie [Fri, 10 Apr 2015 07:47:27 +0000 (02:47 -0500)]
iscsi target: fix oops when adding reject pdu
This fixes a oops due to a double list add when adding a reject PDU for
iscsit_allocate_iovecs allocation failures. The cmd has already been
added to the conn_cmd_list in iscsit_setup_scsi_cmd, so this has us call
iscsit_reject_cmd.
Note that for ERL0 the reject PDU is not actually sent, so this patch
is not completely tested. Just verified we do not oops. The problem is the
add reject functions return -1 which is returned all the way up to
iscsi_target_rx_thread which for ERL0 will drop the connection.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: <stable@vger.kernel.org> # v3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Linus Torvalds [Fri, 10 Apr 2015 18:16:54 +0000 (11:16 -0700)]
Merge tag 'sound-4.0' of git://git./linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"Here are fixes gathered for 4.0-final; one FireFire endian fix, two
USB-audio quirks, and three HD-audio quirks.
All relatively small and device-specific fixes, should be pretty safe
to apply"
* tag 'sound-4.0' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: usb - Creative USB X-Fi Pro SB1095 volume knob support
ALSA: hda - Fix headphone pin config for Lifebook T731
ALSA: bebob: fix to processing in big-endian machine for sending cue
ALSA: hda/realtek - Make more stable to get pin sense for ALC283
ALSA: usb-audio: don't try to get Benchmark DAC1 sample rate
ALSA: hda/realtek - Support Dell headset mode for ALC256
Linus Torvalds [Fri, 10 Apr 2015 17:51:34 +0000 (10:51 -0700)]
Merge tag 'nios2-fixes-v4.0-final' of git://git.rocketboards.org/linux-socfpga-next
Pull arch/nios2 fixes from Ley Foon Tan:
"There are 3 arch/nios2 fixes for 4.0 final:
- fix cache coherency issue when debugging with gdb
- move restart_block to struct task_struct (aligned with other
architectures)
- fix for missing registers defines for ptrace"
* tag 'nios2-fixes-v4.0-final' of git://git.rocketboards.org/linux-socfpga-next:
nios2: fix cache coherency issue when debug with gdb
nios2: add missing ptrace registers defines
nios2: signal: Move restart_block to struct task_struct
Radim Krčmář [Wed, 8 Apr 2015 12:16:48 +0000 (14:16 +0200)]
KVM: use slowpath for cross page cached accesses
kvm_write_guest_cached() does not mark all written pages as dirty and
code comments in kvm_gfn_to_hva_cache_init() talk about NULL memslot
with cross page accesses. Fix all the easy way.
The check is '<= 1' to have the same result for 'len = 0' cache anywhere
in the page. (nr_pages_needed is 0 on page boundary.)
Fixes:
8f964525a121 ("KVM: Allow cross page reads and writes from cached translations.")
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Message-Id: <
20150408121648.GA3519@potion.brq.redhat.com>
Reviewed-by: Wanpeng Li <wanpeng.li@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Mike Travis [Thu, 9 Apr 2015 18:26:31 +0000 (13:26 -0500)]
x86/apic/uv: Update the UV APIC HUB check
Update the check for UV2000/3000. Note when the HUB is not recognized.
Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Hedi Berriche <hedi@sgi.com>
Acked-by: Dimitri Sivanich <sivanich@sgi.com>
Link: http://lkml.kernel.org/r/20150409182629.267239403@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Mike Travis [Thu, 9 Apr 2015 18:26:30 +0000 (13:26 -0500)]
x86/apic/uv: Update the UV APIC driver check
Fix a bug in the OEM check function that determines if the
system is a UV system and the BIOS is compatible with the
kernel's UV apic driver. This prevents some possibly obscure
panics and guards the system against being started on SGI
hardware that does not have the required kernel support.
Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Hedi Berriche <hedi@sgi.com>
Acked-by: Dimitri Sivanich <sivanich@sgi.com>
Link: http://lkml.kernel.org/r/20150409182629.112998930@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Mike Travis [Thu, 9 Apr 2015 18:26:29 +0000 (13:26 -0500)]
x86/apic/uv: Update the APIC UV OEM check
Optimize the first "SGI" OEM check to return faster if the
system is not an SGI or UV system.
Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Hedi Berriche <hedi@sgi.com>
Acked-by: Dimitri Sivanich <sivanich@sgi.com>
Link: http://lkml.kernel.org/r/20150409182628.952357922@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
NeilBrown [Fri, 10 Apr 2015 03:19:04 +0000 (13:19 +1000)]
md/raid0: fix bug with chunksize not a power of 2.
Since commit
20d0189b1012a37d2533a87fb451f7852f2418d1
in v3.14-rc1 RAID0 has performed incorrect calculations
when the chunksize is not a power of 2.
This happens because "sector_div()" modifies its first argument, but
this wasn't taken into account in the patch.
So restore that first arg before re-using the variable.
Reported-by: Joe Landman <joe.landman@gmail.com>
Reported-by: Dave Chinner <david@fromorbit.com>
Fixes:
20d0189b1012a37d2533a87fb451f7852f2418d1
Cc: stable@vger.kernel.org (3.14 and later).
Signed-off-by: NeilBrown <neilb@suse.de>
Ley Foon Tan [Fri, 10 Apr 2015 03:10:08 +0000 (11:10 +0800)]
nios2: fix cache coherency issue when debug with gdb
Remove the end address checking for flushda function. We need to flush
each address line for flushda instruction, from start to end address.
This is because flushda instruction only flush the cache if tag and line
fields are matched.
Change to use ldwio instruction (bypass cache) to load the instruction
that causing trap. Our interest is the actual instruction that executed
by the processor, this should be uncached.
Note, EA address might be an userspace cached address.
Signed-off-by: Ley Foon Tan <lftan@altera.com>
Linus Torvalds [Fri, 10 Apr 2015 00:44:27 +0000 (17:44 -0700)]
Merge tag 'pm+acpi-4.0-rc8' of git://git./linux/kernel/git/rafael/linux-pm
Pull power management and ACPI fixes from Rafael Wysocki:
"These are stable-candidate fixes of some recently reported issues in
the cpufreq core, cpuidle core, the ACPI cpuidle driver and the
hibernate core.
Specifics:
- Revert a 3.17 hibernate commit that was supposed to fix an issue
related to e820 reserved regions, but broke resume from hibernation
on Lenovo x230 (Rafael J Wysocki).
- Prevent the ACPI cpuidle driver from overwriting the name and
description of the C0 state set by the core when the list of
C-states changes (Thomas Schlichter).
- Remove the no longer needed state_count field from struct
cpuidle_device which prevents the list of C-states shown by the
sysfs interface from becoming incorrect when the current number of
them is different from the number of C-states on boot (Bartlomiej
Zolnierkiewicz).
- The cpufreq core updates the policy object of the only online CPU
during system resume to make it reflect the current hardware state,
but it always assumes that CPU to be CPU0 which need not be the
case, so fix the code to avoid that assumption (Viresh Kumar)"
* tag 'pm+acpi-4.0-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
Revert "PM / hibernate: avoid unsafe pages in e820 reserved regions"
cpuidle: ACPI: do not overwrite name and description of C0
cpuidle: remove state_count field from struct cpuidle_device
cpufreq: Schedule work for the first-online CPU on resume
Rafael J. Wysocki [Thu, 9 Apr 2015 21:25:23 +0000 (23:25 +0200)]
Merge branches 'pm-sleep', 'pm-cpufreq' and 'pm-cpuidle'
* pm-sleep:
Revert "PM / hibernate: avoid unsafe pages in e820 reserved regions"
* pm-cpufreq:
cpufreq: Schedule work for the first-online CPU on resume
* pm-cpuidle:
cpuidle: ACPI: do not overwrite name and description of C0
cpuidle: remove state_count field from struct cpuidle_device
Linus Torvalds [Thu, 9 Apr 2015 17:17:44 +0000 (10:17 -0700)]
Merge tag 'pci-v4.0-fixes-3' of git://git./linux/kernel/git/helgaas/pci
Pull PCI fixes from Bjorn Helgaas:
"Here are some fixes for v4.0. I apologize for how late they are. We
were hoping for some better fixes, but couldn't get them polished in
time. These fix:
- a Xen domU oops with PCI passthrough devices
- a sparc T5 boot failure
- a STM SPEAr13xx crash (use after initdata freed)
- a cpcihp hotplug driver thinko
- an AER thinko that printed stack junk
Details:
Enumeration
- Don't look for ACPI hotplug parameters if ACPI is disabled (Bjorn Helgaas)
Resource management
- Revert "sparc/PCI: Clip bridge windows to fit in upstream windows" (Bjorn Helgaas)
AER
- Avoid info leak in __print_tlp_header() (Rasmus Villemoes)
PCI device hotplug
- Add missing curly braces in cpci_configure_slot() (Dan Carpenter)
ST Microelectronics SPEAr13xx host bridge driver
- Drop __initdata from spear13xx_pcie_driver (Matwey V. Kornilov)
* tag 'pci-v4.0-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
Revert "sparc/PCI: Clip bridge windows to fit in upstream windows"
PCI: Don't look for ACPI hotplug parameters if ACPI is disabled
PCI: cpcihp: Add missing curly braces in cpci_configure_slot()
PCI/AER: Avoid info leak in __print_tlp_header()
PCI: spear: Drop __initdata from spear13xx_pcie_driver
Dmitry M. Fedin [Thu, 9 Apr 2015 14:37:03 +0000 (17:37 +0300)]
ALSA: usb - Creative USB X-Fi Pro SB1095 volume knob support
Adds an entry for Creative USB X-Fi to the rc_config array in
mixer_quirks.c to allow use of volume knob on the device.
Adds support for newer X-Fi Pro card, known as "Model No. SB1095"
with USB ID "041e:3237"
Signed-off-by: Dmitry M. Fedin <dmitry.fedin@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Al Viro [Wed, 8 Apr 2015 21:00:32 +0000 (17:00 -0400)]
ocfs2: _really_ sync the right range
"ocfs2 syncs the wrong range" had been broken; prior to it the
code was doing the wrong thing in case of O_APPEND, all right,
but _after_ it we were syncing the wrong range in 100% cases.
*ppos, aka iocb->ki_pos is incremented prior to that point,
so we are always doing sync on the area _after_ the one we'd
written to.
Spotted by Joseph Qi <joseph.qi@huawei.com> back in January;
unfortunately, I'd missed his mail back then ;-/
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Ley Foon Tan [Thu, 9 Apr 2015 10:28:05 +0000 (18:28 +0800)]
nios2: add missing ptrace registers defines
These are all register available in nios2.
Signed-off-by: Ley Foon Tan <lftan@altera.com>
Aravind Gopalakrishnan [Thu, 9 Apr 2015 08:51:48 +0000 (10:51 +0200)]
x86/iommu: Fix header comments regarding standard and _FINISH macros
The comment line regarding IOMMU_INIT and IOMMU_INIT_FINISH
macros is incorrect:
"The standard vs the _FINISH differs in that the _FINISH variant
will continue detecting other IOMMUs in the call list..."
It should be "..the *standard* variant will continue
detecting..."
Fix that. Also, make it readable while at it.
Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: konrad.wilk@oracle.com
Fixes:
6e9636693373 ("x86, iommu: Update header comments with appropriate naming")
Link: http://lkml.kernel.org/r/1428508017-5316-1-git-send-email-Aravind.Gopalakrishnan@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 7 Apr 2015 20:43:44 +0000 (22:43 +0200)]
x86/asm/entry/64: Reduce padding in execve stubs
execve stubs are 7 bytes only. Padding them to 16 bytes is a
waste.
text data bss dec hex filename
12594 0 0 12594 3132 entry_64.o.before
12530 0 0 12530 30f2 entry_64.o
Run-tested.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-8-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 7 Apr 2015 20:43:43 +0000 (22:43 +0200)]
x86/asm/entry/64: Remove GET_THREAD_INFO() in ret_from_fork
It used to be used to check for _TIF_IA32, but the check has
been removed.
Remove GET_THREAD_INFO() too.
Run-tested.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-7-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 7 Apr 2015 20:43:42 +0000 (22:43 +0200)]
x86/asm/entry/64: Simplify jumps in ret_from_fork
Replace
test
jz 1f
jmp label
1:
with
test
jnz label
Run-tested.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-6-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 7 Apr 2015 20:43:41 +0000 (22:43 +0200)]
x86/asm/entry/64: Remove a redundant jump
Jumping to the very next instruction is not very useful:
jmp label
label:
Removing the jump.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-5-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 7 Apr 2015 20:43:40 +0000 (22:43 +0200)]
x86/asm/entry/64: Optimize [v]fork/clone stubs
Replace "call func; ret" with "jmp func".
Run-tested.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-4-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 7 Apr 2015 20:43:39 +0000 (22:43 +0200)]
x86/asm/entry: Zero EXTRA_REGS for stub32_execve() too
The change which affected how execve clears EXTRA_REGS missed
32-bit execve syscalls.
Fix this by using 64-bit execve stub epilogue for them too.
Run-tested.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-3-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 7 Apr 2015 20:43:38 +0000 (22:43 +0200)]
x86/asm/entry/64: Move stub_x32_execvecloser() to stub_execveat()
This is a preparatory patch for moving stub32_execve[at]() to this
file. It makes sense to have all execve stubs in one place, so
that they can reuse code.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Denys Vlasenko [Tue, 7 Apr 2015 20:43:37 +0000 (22:43 +0200)]
x86/asm/entry/64: Use common code for rt_sigreturn() epilogue
Similarly to stub_execve, we can reuse the epilogue in
stub_rt_sigreturn() and stub_x32_rt_sigreturn().
Add a comment explaining why we can't eliminage SAVE_EXTRA_REGS
here.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Anton Blanchard [Thu, 9 Apr 2015 03:51:32 +0000 (13:51 +1000)]
powerpc, jump_label: Include linux/jump_label.h to get HAVE_JUMP_LABEL define
Commit
1bc9e47aa8e4 ("powerpc/jump_label: Use HAVE_JUMP_LABEL")
converted uses of CONFIG_JUMP_LABEL to HAVE_JUMP_LABEL in
some assembly files.
HAVE_JUMP_LABEL is defined in linux/jump_label.h, so we need to
include this or we always get the non jump label fallback code.
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: benh@kernel.crashing.org
Cc: catalin.marinas@arm.com
Cc: davem@davemloft.net
Cc: heiko.carstens@de.ibm.com
Cc: jbaron@akamai.com
Cc: linux@arm.linux.org.uk
Cc: linuxppc-dev@lists.ozlabs.org
Cc: liuj97@gmail.com
Cc: mgorman@suse.de
Cc: mmarek@suse.cz
Cc: paulus@samba.org
Cc: ralf@linux-mips.org
Cc: rostedt@goodmis.org
Cc: schwidefsky@de.ibm.com
Cc: will.deacon@arm.com
Fixes:
1bc9e47aa8e4 ("powerpc/jump_label: Use HAVE_JUMP_LABEL")
Link: http://lkml.kernel.org/r/1428551492-21977-3-git-send-email-anton@samba.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Anton Blanchard [Thu, 9 Apr 2015 03:51:31 +0000 (13:51 +1000)]
jump_label: Allow jump labels to be used in assembly
To use jump labels in assembly we need the HAVE_JUMP_LABEL
define, so we select a fallback version if the toolchain does
not support them.
Modify linux/jump_label.h so it can be included by assembly
files. We also need to add -DCC_HAVE_ASM_GOTO to KBUILD_AFLAGS.
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: benh@kernel.crashing.org
Cc: catalin.marinas@arm.com
Cc: davem@davemloft.net
Cc: heiko.carstens@de.ibm.com
Cc: jbaron@akamai.com
Cc: linux@arm.linux.org.uk
Cc: linuxppc-dev@lists.ozlabs.org
Cc: liuj97@gmail.com
Cc: mgorman@suse.de
Cc: mmarek@suse.cz
Cc: mpe@ellerman.id.au
Cc: paulus@samba.org
Cc: ralf@linux-mips.org
Cc: rostedt@goodmis.org
Cc: schwidefsky@de.ibm.com
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1428551492-21977-2-git-send-email-anton@samba.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Anton Blanchard [Thu, 9 Apr 2015 03:51:30 +0000 (13:51 +1000)]
jump_label: Allow asm/jump_label.h to be included in assembly
Wrap asm/jump_label.h for all archs with #ifndef __ASSEMBLY__.
Since these are kernel only headers, we don't need #ifdef
__KERNEL__ so can simplify things a bit.
If an architecture wants to use jump labels in assembly, it
will still need to define a macro to create the __jump_table
entries (see ARCH_STATIC_BRANCH in the powerpc asm/jump_label.h
for an example).
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: benh@kernel.crashing.org
Cc: catalin.marinas@arm.com
Cc: davem@davemloft.net
Cc: heiko.carstens@de.ibm.com
Cc: jbaron@akamai.com
Cc: linux@arm.linux.org.uk
Cc: linuxppc-dev@lists.ozlabs.org
Cc: liuj97@gmail.com
Cc: mgorman@suse.de
Cc: mmarek@suse.cz
Cc: mpe@ellerman.id.au
Cc: paulus@samba.org
Cc: ralf@linux-mips.org
Cc: rostedt@goodmis.org
Cc: schwidefsky@de.ibm.com
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1428551492-21977-1-git-send-email-anton@samba.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Jason Low [Wed, 8 Apr 2015 19:39:19 +0000 (12:39 -0700)]
locking/mutex: Further simplify mutex_spin_on_owner()
Similar to what Linus suggested for rwsem_spin_on_owner(), in
mutex_spin_on_owner() instead of having while (true) and
breaking out of the spin loop on lock->owner != owner, we can
have the loop directly check for while (lock->owner == owner) to
improve the readability of the code.
It also shrinks the code a bit:
text data bss dec hex filename
3721 0 0 3721 e89 mutex.o.before
3705 0 0 3705 e79 mutex.o.after
Signed-off-by: Jason Low <jason.low2@hp.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Link: http://lkml.kernel.org/r/1428521960-5268-2-git-send-email-jason.low2@hp.com
[ Added code generation info. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linus Torvalds [Wed, 8 Apr 2015 22:12:25 +0000 (15:12 -0700)]
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Pull drm fixes from Dave Airlie:
"Final drm fixes: one core locking imbalance regression, and a bunch of
i915 baytrail s/r fixes"
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
drm: fix drm_mode_getconnector() locking imbalance regression
drm/i915/vlv: remove wait for previous GFX clk disable request
drm/i915/chv: Remove Wait for a previous gfx force-off
drm/i915/vlv: save/restore the power context base reg
Linus Torvalds [Wed, 8 Apr 2015 21:51:56 +0000 (14:51 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/sage/ceph-client
Pull ceph revert from Sage Weil:
"This corrects a recent misadventure with __GFP_MEMALLOC and
PF_MEMALLOC; it turns out it's not a good fit for RBD and we're better
off relying on dirty page throttling"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
Revert "libceph: use memalloc flags for net IO"
Linus Torvalds [Wed, 8 Apr 2015 21:42:49 +0000 (14:42 -0700)]
Merge branch 'akpm' (patches from Andrew)
Merge misc fixes from Andrew Morton:
"Three fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mm: numa: disable change protection for vma(VM_HUGETLB)
include/linux/dmapool.h: declare struct device
mm: move zone lock to a different cache line than order-0 free page lists
Linus Torvalds [Tue, 7 Apr 2015 17:33:49 +0000 (10:33 -0700)]
Copy the kernel module data from user space in chunks
Unlike most (all?) other copies from user space, kernel module loading
is almost unlimited in size. So we do a potentially huge
"copy_from_user()" when we copy the module data from user space to the
kernel buffer, which can be a latency concern when preemption is
disabled (or voluntary).
Also, because 'copy_from_user()' clears the tail of the kernel buffer on
failures, even a *failed* copy can end up wasting a lot of time.
Normally neither of these are concerns in real life, but they do trigger
when doing stress-testing with trinity. Running in a VM seems to add
its own overheadm causing trinity module load testing to even trigger
the watchdog.
The simple fix is to just chunk up the module loading, so that it never
tries to copy insanely big areas in one go. That bounds the latency,
and also the amount of (unnecessarily, in this case) cleared memory for
the failure case.
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Mon, 6 Apr 2015 17:26:17 +0000 (10:26 -0700)]
x86: clean up/fix 'copy_in_user()' tail zeroing
The rule for 'copy_from_user()' is that it zeroes the remaining kernel
buffer even when the copy fails halfway, just to make sure that we don't
leave uninitialized kernel memory around. Because even if we check for
errors, some kernel buffers stay around after thge copy (think page
cache).
However, the x86-64 logic for user copies uses a copy_user_generic()
function for all the cases, that set the "zerorest" flag for any fault
on the source buffer. Which meant that it didn't just try to clear the
kernel buffer after a failure in copy_from_user(), it also tried to
clear the destination user buffer for the "copy_in_user()" case.
Not only is that pointless, it also means that the clearing code has to
worry about the tail clearing taking page faults for the user buffer
case. Which is just stupid, since that case shouldn't happen in the
first place.
Get rid of the whole "zerorest" thing entirely, and instead just check
if the destination is in kernel space or not. And then just use
memset() to clear the tail of the kernel buffer if necessary.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Dave Airlie [Wed, 8 Apr 2015 20:59:50 +0000 (06:59 +1000)]
Merge tag 'drm-intel-fixes-2015-04-08' of git://anongit.freedesktop.org/drm-intel into drm-fixes
three commits, all cc: stable, to address Baytrail
suspend/resume issues.
* tag 'drm-intel-fixes-2015-04-08' of git://anongit.freedesktop.org/drm-intel:
drm/i915/vlv: remove wait for previous GFX clk disable request
drm/i915/chv: Remove Wait for a previous gfx force-off
drm/i915/vlv: save/restore the power context base reg
Al Viro [Wed, 8 Apr 2015 19:45:02 +0000 (15:45 -0400)]
ocfs2_file_write_iter: keep return value and current position update in sync
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Al Viro [Wed, 8 Apr 2015 19:41:17 +0000 (15:41 -0400)]
[regression] ocfs2: do *not* increment ->ki_pos twice
generic_file_direct_write() already does that. Broken by
"ocfs2: do not fallback to buffer I/O write if appending"
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Takashi Iwai [Wed, 8 Apr 2015 18:47:55 +0000 (20:47 +0200)]
ALSA: hda - Fix headphone pin config for Lifebook T731
Some BIOS version of Fujitsu Lifebook T731 seems to set up the
headphone pin (0x21) without the assoc number 0x0f while it's set only
to the output on the docking port (0x1a). With the recent commit
[
03ad6a8c93b6: ALSA: hda - Fix "PCM" name being used on one DAC when
there are two DACs], this resulted in the weird mixer element
mapping where the headphone on the laptop is assigned as a shared
volume with the speaker and the docking port is assigned as an
individual headphone.
This patch improves the situation by correcting the headphone pin
config to the more appropriate value.
Reported-and-tested-by: Taylor Smock <smocktaylor@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Bart Van Assche [Wed, 4 Mar 2015 09:31:47 +0000 (10:31 +0100)]
Defer processing of REQ_PREEMPT requests for blocked devices
SCSI transport drivers and SCSI LLDs block a SCSI device if the
transport layer is not operational. This means that in this state
no requests should be processed, even if the REQ_PREEMPT flag has
been set. This patch avoids that a rescan shortly after a cable
pull sporadically triggers the following kernel oops:
BUG: unable to handle kernel paging request at
ffffc9001a6bc084
IP: [<
ffffffffa04e08f2>] mlx4_ib_post_send+0xd2/0xb30 [mlx4_ib]
Process rescan-scsi-bus (pid: 9241, threadinfo
ffff88053484a000, task
ffff880534aae100)
Call Trace:
[<
ffffffffa0718135>] srp_post_send+0x65/0x70 [ib_srp]
[<
ffffffffa071b9df>] srp_queuecommand+0x1cf/0x3e0 [ib_srp]
[<
ffffffffa0001ff1>] scsi_dispatch_cmd+0x101/0x280 [scsi_mod]
[<
ffffffffa0009ad1>] scsi_request_fn+0x411/0x4d0 [scsi_mod]
[<
ffffffff81223b37>] __blk_run_queue+0x27/0x30
[<
ffffffff8122a8d2>] blk_execute_rq_nowait+0x82/0x110
[<
ffffffff8122a9c2>] blk_execute_rq+0x62/0xf0
[<
ffffffffa000b0e8>] scsi_execute+0xe8/0x190 [scsi_mod]
[<
ffffffffa000b2f3>] scsi_execute_req+0xa3/0x130 [scsi_mod]
[<
ffffffffa000c1aa>] scsi_probe_lun+0x17a/0x450 [scsi_mod]
[<
ffffffffa000ce86>] scsi_probe_and_add_lun+0x156/0x480 [scsi_mod]
[<
ffffffffa000dc2f>] __scsi_scan_target+0xdf/0x1f0 [scsi_mod]
[<
ffffffffa000dfa3>] scsi_scan_host_selected+0x183/0x1c0 [scsi_mod]
[<
ffffffffa000edfb>] scsi_scan+0xdb/0xe0 [scsi_mod]
[<
ffffffffa000ee13>] store_scan+0x13/0x20 [scsi_mod]
[<
ffffffff811c8d9b>] sysfs_write_file+0xcb/0x160
[<
ffffffff811589de>] vfs_write+0xce/0x140
[<
ffffffff81158b53>] sys_write+0x53/0xa0
[<
ffffffff81464592>] system_call_fastpath+0x16/0x1b
[<
00007f611c9d9300>] 0x7f611c9d92ff
Reported-by: Max Gurtuvoy <maxg@mellanox.com>
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: <stable@vger.kernel.org>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
John Soni Jose [Thu, 12 Feb 2015 01:15:47 +0000 (06:45 +0530)]
be2iscsi: Fix kernel panic when device initialization fails
Kernel panic was happening as iscsi_host_remove() was called on
a host which was not yet added.
Signed-off-by: John Soni Jose <sony.john-n@emulex.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: <stable@vger.kernel.org>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Takashi Sakamoto [Wed, 8 Apr 2015 16:15:03 +0000 (01:15 +0900)]
ALSA: bebob: fix to processing in big-endian machine for sending cue
Some M-Audio devices require to receive bootup command just after
powering on, while codes in BeBoB driver doesn't work properly in
big-endian machine because the command should be aligned by
little-endian.
This commit fixes this bug. This fix should go to stable kernel.
Cc: Takayuki Shiroma <t.shiroma.oki@gmail.com>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Bjorn Helgaas [Wed, 8 Apr 2015 15:04:55 +0000 (10:04 -0500)]
Revert "sparc/PCI: Clip bridge windows to fit in upstream windows"
This reverts commit
d63e2e1f3df904bf6bd150bdafb42ddbb3257ea8.
David Ahern reported that
d63e2e1f3df9 breaks booting on an 8-socket T5
sparc system. He also verified that the system boots with
d63e2e1f3df9
reverted. Yinghai has some fixes, but they need a little more polishing
than we can do before v4.0.
Link: http://lkml.kernel.org/r/5514391F.2030300@oracle.com
Link: http://lkml.kernel.org/r/1427857069-6789-1-git-send-email-yinghai@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v3.19+
Bjorn Helgaas [Tue, 24 Mar 2015 16:12:45 +0000 (11:12 -0500)]
PCI: Don't look for ACPI hotplug parameters if ACPI is disabled
Booting a v3.18 or newer Xen domU kernel with PCI devices passed through
results in an oops (this is a 32-bit 3.13.11 dom0 with a 64-bit 4.4.0
hypervisor and 32-bit domU):
BUG: unable to handle kernel paging request at
0030303e
IP: [<
c06ed0e6>] acpi_ns_validate_handle+0x12/0x1a
Call Trace:
[<
c06eda4d>] ? acpi_evaluate_object+0x31/0x1fc
[<
c06b78e1>] ? pci_get_hp_params+0x111/0x4e0
[<
c0407bc7>] ? xen_force_evtchn_callback+0x17/0x30
[<
c04085fb>] ? xen_restore_fl_direct_reloc+0x4/0x4
[<
c0699d34>] ? pci_device_add+0x24/0x450
Don't look for ACPI configuration information if ACPI has been disabled.
I don't think this is the best fix, because we can boot plain Linux (no
Xen) with "acpi=off", and we don't need this check in pci_get_hp_params().
There should be a better fix that would make Xen domU work the same way.
The domU kernel has ACPI support but it has no AML. There should be a way
to initialize the ACPI data structures so things fail gracefully rather
than oopsing. This is an interim fix to address the regression.
Fixes:
6cd33649fa83 ("PCI: Add pci_configure_device() during enumeration")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=96301
Reported-by: Michael D Labriola <mlabriol@gdeb.com>
Tested-by: Michael D Labriola <mlabriol@gdeb.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v3.18+
Kailang Yang [Wed, 8 Apr 2015 08:34:00 +0000 (16:34 +0800)]
ALSA: hda/realtek - Make more stable to get pin sense for ALC283
Pin sense will active when power pin is wake up.
Power pin will not wake up immediately during resume state.
Add some delay to wait for power pin activated.
Signed-off-by: Kailang Yang <kailang@realtek.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Wanpeng Li [Fri, 3 Apr 2015 07:40:25 +0000 (15:40 +0800)]
kvm: mmu: lazy collapse small sptes into large sptes
Dirty logging tracks sptes in 4k granularity, meaning that large sptes
have to be split. If live migration is successful, the guest in the
source machine will be destroyed and large sptes will be created in the
destination. However, the guest continues to run in the source machine
(for example if live migration fails), small sptes will remain around
and cause bad performance.
This patch introduce lazy collapsing of small sptes into large sptes.
The rmap will be scanned in ioctl context when dirty logging is stopped,
dropping those sptes which can be collapsed into a single large-page spte.
Later page faults will create the large-page sptes.
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
Message-Id: <
1428046825-6905-1-git-send-email-wanpeng.li@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Nadav Amit [Thu, 2 Apr 2015 00:10:38 +0000 (03:10 +0300)]
KVM: x86: Clear CR2 on VCPU reset
CR2 is not cleared as it should after reset. See Intel SDM table named "IA-32
Processor States Following Power-up, Reset, or INIT".
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Message-Id: <
1427933438-12782-5-git-send-email-namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Nadav Amit [Thu, 2 Apr 2015 00:10:37 +0000 (03:10 +0300)]
KVM: x86: DR0-DR3 are not clear on reset
DR0-DR3 are not cleared as they should during reset and when they are set from
userspace. It appears to be caused by
c77fb5fe6f03 ("KVM: x86: Allow the guest
to run with dirty debug registers").
Force their reload on these situations.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Message-Id: <
1427933438-12782-4-git-send-email-namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Nadav Amit [Thu, 2 Apr 2015 00:10:36 +0000 (03:10 +0300)]
KVM: x86: BSP in MSR_IA32_APICBASE is writable
After reset, the CPU can change the BSP, which will be used upon INIT. Reset
should return the BSP which QEMU asked for, and therefore handled accordingly.
To quote: "If the MP protocol has completed and a BSP is chosen, subsequent
INITs (either to a specific processor or system wide) do not cause the MP
protocol to be repeated."
[Intel SDM 8.4.2: MP Initialization Protocol Requirements and Restrictions]
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Message-Id: <
1427933438-12782-3-git-send-email-namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
projects / platform / kernel / linux-rpi.git / log