review.tizen.org Git - platform/kernel/linux-starfive.git/log

powerpc/powernv: Fix opal_event_shutdown() called with interrupts disabled

A kernel crash in process context that calls emergency_restart from
panic will end up calling opal_event_shutdown with interrupts disabled
but not in interrupt. This causes a sleeping function to be called
which gives the following warning with sysrq+c:

    Rebooting in 10 seconds..
    BUG: sleeping function called from invalid context at kernel/locking/mutex.c:238
    in_atomic(): 0, irqs_disabled(): 1, pid: 7669, name: bash
    CPU: 20 PID: 7669 Comm: bash Tainted: G      D W         4.17.0-rc5+ #3
    Call Trace:
    dump_stack+0xb0/0xf4 (unreliable)
    ___might_sleep+0x174/0x1a0
    mutex_lock+0x38/0xb0
    __free_irq+0x68/0x460
    free_irq+0x70/0xc0
    opal_event_shutdown+0xb4/0xf0
    opal_shutdown+0x24/0xa0
    pnv_shutdown+0x28/0x40
    machine_shutdown+0x44/0x60
    machine_restart+0x28/0x80
    emergency_restart+0x30/0x50
    panic+0x2a0/0x328
    oops_end+0x1ec/0x1f0
    bad_page_fault+0xe8/0x154
    handle_page_fault+0x34/0x38
    --- interrupt: 300 at sysrq_handle_crash+0x44/0x60
    LR = __handle_sysrq+0xfc/0x260
    flag_spec.62335+0x12b844/0x1e8db4 (unreliable)
    __handle_sysrq+0xfc/0x260
    write_sysrq_trigger+0xa8/0xb0
    proc_reg_write+0xac/0x110
    __vfs_write+0x6c/0x240
    vfs_write+0xd0/0x240
    ksys_write+0x6c/0x110

Fixes: 9f0fd0499d30 ("powerpc/powernv: Add a virtual irqchip for opal events")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/32: Use stmw/lmw for registers save/restore in asm

arch/powerpc/Makefile activates -mmultiple on BE PPC32 configs
in order to use multiple word instructions in functions entry/exit.

The patch does the same for the asm parts, for consistency.

On processors like the 8xx on which insn fetching is pretty slow,
this speeds up registers save/restore.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: PPC32 is BE only, so drop the endian checks]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: Avoid an unnecessary test and branch in longjmp()

Doing the test at exit of the function avoids an unnecessary
test and branch inside longjmp().

Semantics are unchanged.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Revert "powerpc/64: Fix checksum folding in csum_add()"

This reverts commit 6ad966d7303b70165228dba1ee8da1a05c10eefe.

That commit was pointless, because csum_add() sums two 32 bits
values, so the sum is 0x1fffffffe at the maximum.
And then when adding upper part (1) and lower part (0xfffffffe),
the result is 0xffffffff which doesn't carry.
Any lower value will not carry either.

And behind the fact that this commit is useless, it also kills the
whole purpose of having an arch specific inline csum_add()
because the resulting code gets even worse than what is obtained
with the generic implementation of csum_add()

0000000000000240 <.csum_add>:
240: 38 00 ff ff li      r0,-1
244: 7c 84 1a 14 add     r4,r4,r3
248: 78 00 00 20 clrldi  r0,r0,32
24c: 78 89 00 22 rldicl  r9,r4,32,32
250: 7c 80 00 38 and     r0,r4,r0
254: 7c 09 02 14 add     r0,r9,r0
258: 78 09 00 22 rldicl  r9,r0,32,32
25c: 7c 00 4a 14 add     r0,r0,r9
260: 78 03 00 20 clrldi  r3,r0,32
264: 4e 80 00 20 blr

In comparison, the generic implementation of csum_add() gives:

0000000000000290 <.csum_add>:
290: 7c 63 22 14 add     r3,r3,r4
294: 7f 83 20 40 cmplw   cr7,r3,r4
298: 7c 10 10 26 mfocrf  r0,1
29c: 54 00 ef fe rlwinm  r0,r0,29,31,31
2a0: 7c 60 1a 14 add     r3,r0,r3
2a4: 78 63 00 20 clrldi  r3,r3,32
2a8: 4e 80 00 20 blr

And the reverted implementation for PPC64 gives:

0000000000000240 <.csum_add>:
240: 7c 84 1a 14 add     r4,r4,r3
244: 78 80 00 22 rldicl  r0,r4,32,32
248: 7c 80 22 14 add     r4,r0,r4
24c: 78 83 00 20 clrldi  r3,r4,32
250: 4e 80 00 20 blr

Fixes: 6ad966d7303b7 ("powerpc/64: Fix checksum folding in csum_add()")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: get rid of PMD_PAGE_SIZE() and _PMD_SIZE

PMD_PAGE_SIZE() is nowhere used and _PMD_SIZE is only
used by PMD_PAGE_SIZE().

This patch removes them.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/embedded6xx/hlwd-pic: Prevent interrupts from being handled by Starlet

The interrupt controller inside the Wii's Hollywood chip is connected to
two masters, the "Broadway" PowerPC and the "Starlet" ARM926, each with
their own interrupt status and mask registers.

When booting the Wii with mini[1], interrupts from the SD card
controller (IRQ 7) are handled by the ARM, because mini provides SD
access over IPC. Linux however can't currently use or disable this IPC
service, so both sides try to handle IRQ 7 without coordination.

Let's instead make sure that all interrupts that are unmasked on the PPC
side are masked on the ARM side; this will also make sure that Linux can
properly talk to the SD card controller (and potentially other devices).

If access to a device through IPC is desired in the future, interrupts
from that device should not be handled by Linux directly.

[1]: https://github.com/lewurm/mini

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/embedded6xx/flipper-pic: Don't match all IRQ domains

On the Wii, there is a secondary IRQ controller (hlwd-pic), so
flipper-pic's match operation should not be hardcoded to return 1.
In fact, the default matching logic is sufficient, and we can completely
omit flipper_pic_match.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm: Use page fragments for allocation page table at PMD level

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm: Implement helpers for pagetable fragment support at PMD level

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/book3s64/mm: Simplify the rcu callback for page table free

Instead of encoding shift in the table address, use an enumerated index value.
This allow us to do different things in the callback for pte and pmd.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm/book3s64/4k: Switch 4k pagesize config to use pagetable fragment

4K config use one full page at level 4 of the pagetable. Add support for single
fragment allocation in pagetable fragment code and and use that for 4K config.
This makes both 4k and 64k use the same code path. Later we will switch pmd to
use the page table fragment code. This is done only for 64bit platforms which
is using page table fragment support.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm/nohash: Remove pte fragment dependency from nohash

Now that we have removed 64K page size support, the RCU page table free can
be much simpler for nohash. Make a copy of the the rcu callback to pgalloc.h
header similar to nohash 32. We could possibly merge 32 and 64 bit there. But
that is for a later patch

We also move the book3s specific handler to pgtable_book3s64.c. This will be
updated in a later patch to handle split pmd ptlock.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm/book3e/64: Remove unsupported 64Kpage size from 64bit booke

We have in Kconfig

config PPC_64K_PAGES
bool "64k page size"
depends on !PPC_FSL_BOOK3E && (44x || PPC_BOOK3S_64 || PPC_BOOK3E_64)
select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64

Only supported BOOK3E 64 bit platforms is FSL_BOOK3E. Remove the dead 64k page
support code from 64bit nohash.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm: Rename pte fragment functions

We rename the alloc and get_from_cache to indicate they operate on pte
fragments. In later patch we will add pmd fragment support.

No functional change in this patch.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm: Use pmd_lockptr instead of opencoding it

In later patch we switch pmd_lock from mm->page_table_lock to split pmd ptlock.
It avoid compilations issues, use pmd_lockptr helper.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm/book3s64: Move book3s64 code to pgtable-book3s64

Only code movement and avoid #ifdef.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Merge branch 'topic/ppc-kvm' into next

This brings in one commit that we may want to share with the kvm-ppc
tree, to avoid merge conflicts and get wider testing.

powerpc/kvm: Switch kvm pmd allocator to custom allocator

In the next set of patches, we will switch pmd allocator to use page fragments
and the locking will be updated to split pmd ptlock. We want to avoid using
fragments for partition-scoped table. Use slab cache similar to level 4 table

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/cell/spufs: Change return type to vm_fault_t

Use new return type vm_fault_t for fault handler. For now, this is
just documenting that the function returns a VM_FAULT value rather
than an errno. Once all instances are converted, vm_fault_t will
become a distinct type. See commit 1c8f422059ae ("mm: change return
type to vm_fault_t").

We are fixing a minor bug, that the error from vm_insert_pfn() was
being ignored and the effect of this is likely to be only felt in OOM
situations.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

macintosh/windfarm: fix spelling mistake: "ttarged" -> "ttarget"

Trivial fix to spelling mistake in debug messages of a structure
field name

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

selftests/powerpc: fix exec benchmark

The exec_target binary could segfault calling _exit(2) because r13
is not set up properly (and libc looks at that when performing a
syscall). Call SYS_exit using syscall(2) which doesn't seem to
have this problem.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/ioda: Use ibm, supported-tce-sizes for IOMMU page size mask

At the moment we assume that IODA2 and newer PHBs can always do 4K/64K/16M
IOMMU pages, however this is not the case for POWER9 and now skiboot
advertises the supported sizes via the device so we use that instead
of hard coding the mask.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/powernv: Fix memtrace build when NUMA=n

Currently memtrace doesn't build if NUMA=n:

  In function ‘memtrace_alloc_node’:
  arch/powerpc/platforms/powernv/memtrace.c:134:6:
  error: the address of ‘contig_page_data’ will always evaluate as ‘true’
    if (!NODE_DATA(nid) || !node_spanned_pages(nid))
        ^

This is because for NUMA=n NODE_DATA(nid) points to an always
allocated structure, contig_page_data.

But even in the NUMA=y case memtrace_alloc_node() is only called for
online nodes, and we should always have a NODE_DATA() allocated for an
online node. So remove the (hopefully) overly paranoid check, which
also means we can build when NUMA=n.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/prom: Drop support for old FDT versions

In commit e6a6928c3ea1 ("of/fdt: Convert FDT functions to use
libfdt") (Apr 2014), the generic flat device tree code dropped support
for flat device tree's older than version 0x10 (16).

We still have code in our CPU scanning to cope with flat device tree
versions earlier than 2, which can now never trigger, so drop it.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/lib: Add alt patching test of branching past the last instruction

Add a test of the relative branch patching logic in the alternate
section feature fixup code. This tests that if we branch past the last
instruction of the alternate section, the branch is not patched.
That's because the assembler will have created a branch that already
points to the first instruction after the patched section, which is
correct and needs no further patching.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/lib: Rename ftr_fixup_test7 to ftr_fixup_test_too_big

We want this to remain the last test (because it's disabled by
default), so give it a non-numbered name so we don't have to renumber
it when adding new tests before it.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/lib: Fix the feature fixup tests to actually work

The code patching code has always been a bit confused about whether
it's best to use void *, unsigned int *, char *, etc. to point to
instructions. In fact in the feature fixups tests we use both unsigned
int[] and u8[] in different places.

Unfortunately the tests that use unsigned int[] calculate the size of
the code blocks using subtraction of those unsigned int pointers, and
then pass the result to memcmp(). This means we're only comparing 1/4
of the bytes we need to, because we need to multiply by
sizeof(unsigned int) to get the number of *bytes*.

The result is that the tests do all the patching and then only compare
some of the resulting code, so patching bugs that only effect that
last 3/4 of the code could slip through undetected. It turns out that
hasn't been happening, although one test had a bad expected case (see
previous commit).

Fix it for now by multiplying the size by 4 in the affected functions.

Fixes: 362e7701fd18 ("powerpc: Add self-tests of the feature fixup code")
Epic-brown-paper-bag-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/lib: Fix feature fixup test of external branch

The expected case for this test was wrong, the source of the alternate
code sequence is:

  FTR_SECTION_ELSE
  2: or 2,2,2
   PPC_LCMPI r3,1
   beq 3f
   blt 2b
   b 3f
   b 1b
  ALT_FTR_SECTION_END(0, 1)
  3: or 1,1,1
   or 2,2,2
  4: or 3,3,3

So when it's patched the '3' label should still be on the 'or 1,1,1',
and the 4 label is irrelevant and can be removed.

Fixes: 362e7701fd18 ("powerpc: Add self-tests of the feature fixup code")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: Make it clearer that systbl check errors are errors

If the systbl_chk.sh checks fail we print a message, but with no
indication that it's an error. That makes it hard to find in build
logs with eg. grep.

So prefix any output with "Error:".

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/syscalls: timer_create can be handle by perfectly normal COMPAT_SYS_SPU

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/syscalls: kill ppc32_select()

it had always been pointless - compat_sys_select() sign-extends
the first argument just fine on its own.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[mpe: Use COMPAT_SPU_NEW() to keep systbl_chk.sh happy]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/syscalls: Add COMPAT_SPU_NEW() macro

Currently the select system call is wired up with the SYSX_SPU()
macro. The SYSX_SPU() is not handled by systbl_chk.c, which means the
syscall number for select is not checked.

That hides the fact that the syscall number for select is actually
__NR__newselect not __NR_select.

In a following patch we'd like to drop ppc32_select() which means
select will become a regular COMPAT_SYS_SPU() syscall. But
COMPAT_SYS_SPU() can't deal with the fact that the syscall number is
actually __NR__newselect. We also can't just redefine __NR_select
because that's still used for the old select call.

So add a new COMPAT_NEW_SPU() that does the same thing as
COMPAT_SYS_SPU() except it encodes that we're using the new number.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/syscalls: switch rtas(2) to SYSCALL_DEFINE

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[mpe: Update sys_ni.c for s/ppc_rtas/sys_rtas/]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/syscalls: signal_{32, 64} - switch to SYSCALL_DEFINE

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[mpe: Fix sys_debug_setcontext() prototype to return long]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/syscalls: Switch trivial cases to SYSCALL_DEFINE

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/livepatch: Implement reliable stack tracing for the consistency model

The "Power Architecture 64-Bit ELF V2 ABI" says in section 2.3.2.3:

[...] There are several rules that must be adhered to in order to ensure
reliable and consistent call chain backtracing:

* Before a function calls any other function, it shall establish its
  own stack frame, whose size shall be a multiple of 16 bytes.

– In instances where a function’s prologue creates a stack frame, the
   back-chain word of the stack frame shall be updated atomically with
   the value of the stack pointer (r1) when a back chain is implemented.
   (This must be supported as default by all ELF V2 ABI-compliant
   environments.)
[...]
– The function shall save the link register that contains its return
   address in the LR save doubleword of its caller’s stack frame before
   calling another function.

To me this sounds like the equivalent of HAVE_RELIABLE_STACKTRACE.
This patch may be unneccessarily limited to ppc64le, but OTOH the only
user of this flag so far is livepatching, which is only implemented on
PPCs with 64-LE, a.k.a. ELF ABI v2.

Feel free to add other ppc variants, but so far only ppc64le got tested.

This change also implements save_stack_trace_tsk_reliable() for ppc64le
that checks for the above conditions, where possible.

Signed-off-by: Torsten Duwe <duwe@suse.de>
Signed-off-by: Nicolai Stange <nstange@suse.de>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/watchdog: provide more data in watchdog messages

Provide timebase and timebase of last heartbeat in watchdog lockup
messages. Also provide a stack trace of when a CPU becomes un-stuck,
which can be useful -- it could be where irqs are re-enabled, so it
may be the end of the critical section which is responsible for the
latency which is useful information.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/watchdog: don't update the watchdog timestamp if a lockup is detected

The watchdog heartbeat timestamp is updated when the local heartbeat
timer fires (or touch_nmi_watchdog() is called).

This is an interesting data point, so don't overwrite it when the
soft-NMI interrupt detects a hard lockup. That code came from a pre-
merge version to prevent hard lockup messages flood, but that's taken
care of with the stuck CPU logic now, so there is no reason to
update the heartbeat timestamp here.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/xive: prepare all hcalls to support long busy delays

This is not the case for the moment, but future releases of pHyp might
need to introduce some synchronisation routines under the hood which
would make the XIVE hcalls longer to complete.

As this was done for H_INT_RESET, let's wrap the other hcalls in a
loop catching the H_LONG_BUSY_* codes.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/xive: shutdown XIVE when kexec or kdump is performed

The hcall H_INT_RESET should be called to make sure XIVE is fully
reseted.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/xive: fix hcall H_INT_RESET to support long busy delays

The hcall H_INT_RESET can take some time to complete and in such cases
it returns H_LONG_BUSY_* codes requiring the machine to sleep for a
while before retrying.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/64/kexec: fix race in kexec when XIVE is shutdown

The kexec_state KEXEC_STATE_IRQS_OFF barrier is reached by all
secondary CPUs before the kexec_cpu_down() operation is called on
secondaries. This can raise conflicts and provoque errors in the XIVE
hcalls when XIVE is shutdown with H_INT_RESET on the primary CPU.

To synchronize the kexec_cpu_down() operations and make sure the
secondaries have completed their task before the primary starts doing
the same, let's move the primary kexec_cpu_down() after the
KEXEC_STATE_REAL_MODE barrier.

This change of the ending sequence of kexec is mostly useful on the
pseries platform but it impacts also the powernv, ps3 and 85xx
platforms. powernv can be easily tested and fixed but some caution is
required for the other two.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/config: powernv_defconfig updates

For consideration:

* Add NVDIMM support - Enables greater testing, mambo device.
* Add IPv6 support built in + additional modules - Because it's 2018 maan.
* Add DEFERRED_STRUCT_PAGE_INIT - Let's see what breaks.
* Add PPC_MEMTRACE - Small powernv debugfs driver for getting hardware traces.
* Add MEMORY_FAILURE - Machine check exceptions can now drive memory failure.
* Turn on FANOTIFY - This is the current filesystem notification feature.
* Turn on SCOM_DEBUGFS - Handy for hardware/firmware debugging, security risk?
* Turn on async SCSI scanning - Let's see what breaks.
* Add MLX5 driver as a module - Popular demand.
* Add CRYPTO_CRCT10DIF_VPMSUM - POWER8 T10DIF acceleration.

* Make a bunch of USB hid drivers modules.
* Make SCSI SG, SR, and FC modules - FC is huge.
* Make video drivers except AST GPU modules - Also huge.
* Make PCI serial driver a module - Uncommon.
* Make more things modules, NFS FS, RAM disk, netconsole, MS-DOS fs.

* Get rid of /dev/port - Not used.
* Remove PPS and PTP subsystms - Unusual.
* Remove legacy BSD ttys - Long dead.
* Remove IDE - Deprecated and replaced with ATA.
* Remove WIRELESS - Until we get POWER9 laptops.
* Remove RAW - Long deprecated in favour of direct IO.
* Remove floppy, parport, and PS2 input devices - not supported.
* Remove virtio drivers, ballooning - We're host only.
* Remove PPP - Sorry Paulus.

This results in a significantly smaller vmlinux:

    text      data       bss        dec   filename
13143383   5277944   1317856   19739183   vanilla
12263281   4852074   1341720   18457075   patched

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: wii_defconfig: Disable BCMA support

The B43 driver only needs CONFIG_SSB to support the WLAN card found in
the Wii. Configure it accordingly, and disable BCMA bus support to save
a bit of space.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: wii_defconfig: Enable Wii SDHCI driver

This allows access to the SD card and the BCM4318 Wifi module.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: wii_defconfig: Enable GPIO-related options

Now that there's a GPIO driver for the Wii, let's enable the following
drivers:

- the GPIO driver itself
- gpio-keys
- gpio-poweroff
- gpio-leds and a few LED triggers

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: wii_defconfig: Disable Ethernet driver support code

The Wii doesn't have built-in Ethernet and USB Ethernet adapters are in
a different menu. Disable CONFIG_ETHERNET to save some space in support
code for Ethernet drivers.

Note that this patch doesn't disable any Ethernet drivers, because they
are not enabled by default.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/watchdog: fix typo 'can by' to 'can be'

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/pseries: hcall_exit tracepoint retval should be signed

The hcall_exit() tracepoint has retval defined as unsigned long. That
leads to humours results like:

  bash-3686  [009] d..2   854.134094: hcall_entry: opcode=24
  bash-3686  [009] d..2   854.134095: hcall_exit: opcode=24 retval=18446744073709551609

It's normal for some hcalls to return negative values, displaying them
as unsigned isn't very helpful. So change it to signed.

  bash-3711  [001] d..2   471.691008: hcall_entry: opcode=24
  bash-3711  [001] d..2   471.691008: hcall_exit: opcode=24 retval=-7

Which can be more easily compared to H_NOT_FOUND in hvcall.h

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>

Revert "powerpc/powernv: Increase memory block size to 1GB on radix"

This commit was a stop-gap to prevent crashes on hotunplug, caused by
the mismatch between the 1G mappings used for the linear mapping and the
memory block size. Those issues are now resolved because we split the
linear mapping at hotunplug time if necessary, as implemented in commit
4dd5f8a99e79 ("powerpc/mm/radix: Split linear mapping on hot-unplug").

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Tested-by: Rashmica Gupta <rashmica.g@gmail.com>
Tested-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/nohash: Use IS_ENABLED() to simplify __set_pte_at()

By using IS_ENABLED() we can simplify __set_pte_at() by removing
redundant *ptep = pte.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/nohash: Remove _PAGE_BUSY

_PAGE_BUSY is always 0, remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/nohash: Remove hash related code from nohash headers.

When nohash and book3s header were split, some hash related stuff
remained in the nohash header. This patch removes them.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Duplicate pte_young() to avoid circular header dependency]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/fadump: Unregister fadump on kexec down path.

Unregister fadump on kexec down path otherwise the fadump registration
in new kexec-ed kernel complains that fadump is already registered.
This makes new kernel to continue using fadump registered by previous
kernel which may lead to invalid vmcore generation. Hence this patch
fixes this issue by un-registering fadump in fadump_cleanup() which is
called during kexec path so that new kernel can register fadump with
new valid values.

Fixes: b500afff11f6 ("fadump: Invalidate registration and release reserved memory for general use.")
Cc: stable@vger.kernel.org # v3.4+
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/fadump: Do not use hugepages when fadump is active

FADump capture kernel boots in restricted memory environment preserving
the context of previous kernel to save vmcore. Supporting hugepages in
such environment makes things unnecessarily complicated, as hugepages
need memory set aside for them. This means most of the capture kernel's
memory is used in supporting hugepages. In most cases, this results in
out-of-memory issues while booting FADump capture kernel. But hugepages
are not of much use in capture kernel whose only job is to save vmcore.
So, disabling hugepages support, when fadump is active, is a reliable
solution for the out of memory issues. Introducing a flag variable to
disable HugeTLB support when fadump is active.

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/fadump: exclude memory holes while reserving memory in second kernel

The second kernel, during early boot after the crash, reserves rest of
the memory above boot memory size to make sure it does not touch any of the
dump memory area. It uses memblock_reserve() that reserves the specified
memory region irrespective of memory holes present within that region.
There are chances where previous kernel would have hot removed some of
its memory leaving memory holes behind. In such cases fadump kernel reports
incorrect number of reserved pages through arch_reserved_kernel_pages()
hook causing kernel to hang or panic.

Fix this by excluding memory holes while reserving rest of the memory
above boot memory size during second kernel boot after crash.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

tracing: Remove PPC32 wart from config TRACING_SUPPORT

config TRACING_SUPPORT has an exception for PPC32, because PPC32
didn't have irqflags tracing support.

But that hasn't been true since commit 5d38902c4838 ("powerpc: Add
irqtrace support for 32-bit powerpc") (Jun 2009).

So remove the exception for PPC32 and the comment.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: remove retired sbc834x support

I no longer have a functional version of this board for even the most
basic sanity boot testing, and they have not been available for purchase
for quite some years now.

There is no point in adding a burden to testing coverage that does
walk all the possible defconfigs, so with all the above in mind, it
makes sense to remove it. Of course it will remain in the git history
for anyone who happens to stumble on one and wants to tinker with it.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc: Only support DYNAMIC_FTRACE not static

We've had dynamic ftrace support for over 9 years since Steve first
wrote it, all the distros use dynamic, and static is basically
untested these days, so drop support for static ftrace.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/ftrace: Implement support for ftrace_regs_caller()

With -mprofile-kernel, we always save the full register state in
ftrace_caller(). While this works, this is inefficient if we're not
interested in the register state, such as when we're using the function
tracer.

Rename the existing ftrace_caller() as ftrace_regs_caller() and provide
a simpler implementation for ftrace_caller() that is used when registers
are not required to be saved.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/ftrace: Use the generic version of ftrace_replace_code()

Our implementation matches that of the generic version, which also
handles FTRACE_UPDATE_MODIFY_CALL. So, remove our implementation in
favor of the generic version.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/module: Tighten detection of mcount call sites with -mprofile-kernel

For R_PPC64_REL24 relocations, we suppress emitting instructions for TOC
load/restore in the relocation stub if the relocation is for _mcount()
call when using -mprofile-kernel ABI.

To detect this, we check if the preceding instructions are per the
standard set of instructions emitted by gcc: either the two instruction
sequence of 'mflr r0; std r0,16(r1)', or the more optimized variant of a
single 'mflr r0'. This is not sufficient since nothing prevents users
from hand coding sequences involving a 'mflr r0' followed by a 'bl'.

For removing the toc save instruction from the stub, we additionally
check if the symbol is "_mcount". Add the same check here as well.

Also rename is_early_mcount_callsite() to is_mprofile_mcount_callsite()
since that is what is being checked. The use of "early" is misleading
since there is nothing involving this function that qualifies as early.

Fixes: 153086644fd1f ("powerpc/ftrace: Add support for -mprofile-kernel ftrace ABI")
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/kexec: Hard disable ftrace before switching to the new kernel

If function_graph tracer is enabled during kexec, we see the below
exception in the simulator:
root@(none):/# kexec -e
kvm: exiting hardware virtualization
kexec_core: Starting new kernel
[ 19.262020070,5] OPAL: Switch to big-endian OS
kexec: Starting switchover sequence.
Interrupt to 0xC000000000004380 from 0xC000000000004380
** Execution stopped: Continuous Interrupt, Instruction caused exception, **

Now that we have a more effective way to completely disable ftrace on
ppc64, let's also use that before switching to a new kernel during
kexec.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/ftrace: Disable ftrace during kvm entry/exit

During guest entry/exit, we switch over to/from the guest MMU context
and we cannot take exceptions in the hypervisor code.

Since ftrace may be enabled and since it can result in us taking a trap,
disable ftrace by setting paca->ftrace_enabled to zero. There are two
paths through which we enter/exit a guest:
1. If we are the vcore runner, then we enter the guest via
__kvmppc_vcore_entry() and we disable ftrace around this. This is always
the case for Power9, and for the primary thread on Power8.
2. If we are a secondary thread in Power8, then we would be in nap due
to SMT being disabled. We are woken up by an IPI to enter the guest. In
this scenario, we enter the guest through kvm_start_guest(). We disable
ftrace at this point. In this scenario, ftrace would only get re-enabled
on the secondary thread when SMT is re-enabled (via start_secondary()).

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/ftrace: Disable ftrace during hotplug

Disable ftrace when a cpu is about to go offline. When the cpu is woken
up, ftrace will get enabled in start_secondary().

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/ftrace: Delay enabling ftrace on secondary cpus

On the boot cpu, though we enable paca->ftrace_enabled in early_setup()
(via cpu_ready_for_interrupts()), we don't start tracing until much
later since ftrace is not initialized yet and since we only support
DYNAMIC_FTRACE on powerpc. However, it is possible that ftrace has been
initialized by the time some of the secondary cpus start up. In this
case, we will try to trace some of the early boot code which can cause
problems.

To address this, move setting paca->ftrace_enabled from
cpu_ready_for_interrupts() to early_setup() for the boot cpu, and towards
the end of start_secondary() for secondary cpus.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/ftrace: Add helpers to hard disable ftrace

Add some helpers to enable/disable ftrace through paca->ftrace_enabled.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/ftrace: Rearrange #ifdef sections in ftrace.h

Re-arrange the last #ifdef section in preparation for a subsequent
change.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths

We have some C code that we call into from real mode where we cannot
take any exceptions. Though the C functions themselves are mostly safe,
if these functions are traced, there is a possibility that we may take
an exception. For instance, in certain conditions, the ftrace code uses
WARN(), which uses a 'trap' to do its job.

For such scenarios, introduce a new field in paca 'ftrace_enabled',
which is checked on ftrace entry before continuing. This field can then
be set to zero to disable/pause ftrace, and set to a non-zero value to
resume ftrace.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Linux v4.17-rc3

Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
"Another set of x86 related updates:

   - Fix the long broken x32 version of the IPC user space headers which
     was noticed by Arnd Bergman in course of his ongoing y2038 work.
     GLIBC seems to have non broken private copies of these headers so
     this went unnoticed.

   - Two microcode fixlets which address some more fallout from the
     recent modifications in that area:

      - Unconditionally save the microcode patch, which was only saved
        when CPU_HOTPLUG was enabled causing failures in the late
        loading mechanism

      - Make the later loader synchronization finally work under all
        circumstances. It was exiting early and causing timeout failures
        due to a missing synchronization point.

   - Do not use mwait_play_dead() on AMD systems to prevent excessive
     power consumption as the CPU cannot go into deep power states from
     there.

   - Address an annoying sparse warning due to lost type qualifiers of
     the vmemmap and vmalloc base address constants.

   - Prevent reserving crash kernel region on Xen PV as this leads to
     the wrong perception that crash kernels actually work there which
     is not the case. Xen PV has its own crash mechanism handled by the
     hypervisor.

   - Add missing TLB cpuid values to the table to make the printout on
     certain machines correct.

   - Enumerate the new CLDEMOTE instruction

   - Fix an incorrect SPDX identifier

   - Remove stale macros"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/ipc: Fix x32 version of shmid64_ds and msqid64_ds
  x86/setup: Do not reserve a crash kernel region if booted on Xen PV
  x86/cpu/intel: Add missing TLB cpuid values
  x86/smpboot: Don't use mwait_play_dead() on AMD systems
  x86/mm: Make vmemmap and vmalloc base address constants unsigned long
  x86/vector: Remove the unused macro FPU_IRQ
  x86/vector: Remove the macro VECTOR_OFFSET_START
  x86/cpufeatures: Enumerate cldemote instruction
  x86/microcode: Do not exit early from __reload_late()
  x86/microcode/intel: Save microcode patch unconditionally
  x86/jailhouse: Fix incorrect SPDX identifier

Merge branch 'x86-pti-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 pti fixes from Thomas Gleixner:
"A set of updates for the x86/pti related code:

   - Preserve r8-r11 in int $0x80. r8-r11 need to be preserved, but the
     int$80 entry code removed that quite some time ago. Make it correct
     again.

   - A set of fixes for the Global Bit work which went into 4.17 and
     caused a bunch of interesting regressions:

      - Triggering a BUG in the page attribute code due to a missing
        check for early boot stage

      - Warnings in the page attribute code about holes in the kernel
        text mapping which are caused by the freeing of the init code.
        Handle such holes gracefully.

      - Reduce the amount of kernel memory which is set global to the
        actual text and do not incidentally overlap with data.

      - Disable the global bit when RANDSTRUCT is enabled as it
        partially defeats the hardening.

      - Make the page protection setup correct for vma->page_prot
        population again. The adjustment of the protections fell through
        the crack during the Global bit rework and triggers warnings on
        machines which do not support certain features, e.g. NX"

* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry/64/compat: Preserve r8-r11 in int $0x80
  x86/pti: Filter at vma->vm_page_prot population
  x86/pti: Disallow global kernel text with RANDSTRUCT
  x86/pti: Reduce amount of kernel text allowed to be Global
  x86/pti: Fix boot warning from Global-bit setting
  x86/pti: Fix boot problems from Global-bit setting

Merge branch 'timers-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull timer fixes from Thomas Gleixner:
"Two fixes from the timer departement:

   - Fix a long standing issue in the NOHZ tick code which causes RB
     tree corruption, delayed timers and other malfunctions. The cause
     for this is code which modifies the expiry time of an enqueued
     hrtimer.

   - Revert the CLOCK_MONOTONIC/CLOCK_BOOTTIME unification due to
     regression reports. Seems userspace _is_ relying on the documented
     behaviour despite our hope that it wont"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Revert: Unify CLOCK_MONOTONIC and CLOCK_BOOTTIME
  tick/sched: Do not mess with an enqueued hrtimer

Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull perf fixes from Thomas Gleixner:
"The perf update contains the following bits:

  x86:
   - Prevent setting freeze_on_smi on PerfMon V1 CPUs to avoid #GP

  perf stat:
   - Keep the '/' event modifier separator in fallback, for example when
     fallbacking from 'cpu/cpu-cycles/' to user level only, where it
     should become 'cpu/cpu-cycles/u' and not 'cpu/cpu-cycles/:u' (Jiri
     Olsa)

   - Fix PMU events parsing rule, improving error reporting for invalid
     events (Jiri Olsa)

   - Disable write_backward and other event attributes for !group events
     in a group, fixing, for instance this group: '{cycles,msr/aperf/}:S'
     that has leader sampling (:S) and where just the 'cycles', the
     leader event, should have the write_backward attribute set, in this
     case it all fails because the PMU where 'msr/aperf/' lives doesn't
     accepts write_backward style sampling (Jiri Olsa)

   - Only fall back group read for leader (Kan Liang)

   - Fix core PMU alias list for x86 platform (Kan Liang)

   - Print out hint for mixed PMU group error (Kan Liang)

   - Fix duplicate PMU name for interval print (Kan Liang)

  Core:
   - Set main kernel end address properly when reading kernel and module
     maps (Namhyung Kim)

  perf mem:
   - Fix incorrect entries and add missing man options (Sangwon Hong)

  s/390:
   - Remove s390 specific strcmp_cpuid_cmp function (Thomas Richter)

   - Adapt 'perf test' case record+probe_libc_inet_pton.sh for s390

   - Fix s390 undefined record__auxtrace_init() return value in 'perf
     record' (Thomas Richter)"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel: Don't enable freeze-on-smi for PerfMon V1
  perf stat: Fix duplicate PMU name for interval print
  perf evsel: Only fall back group read for leader
  perf stat: Print out hint for mixed PMU group error
  perf pmu: Fix core PMU alias list for X86 platform
  perf record: Fix s390 undefined record__auxtrace_init() return value
  perf mem: Document incorrect and missing options
  perf evsel: Disable write_backward for leader sampling group events
  perf pmu: Fix pmu events parsing rule
  perf stat: Keep the / modifier separator in fallback
  perf test: Adapt test case record+probe_libc_inet_pton.sh for s390
  perf list: Remove s390 specific strcmp_cpuid_cmp function
  perf machine: Set main kernel end address properly

Merge tag 'for_linus_stable' of git://git./linux/kernel/git/tytso/ext4

Pull ext4 fixes from Ted Ts'o:
"Fix misc bugs and a regression for ext4"

* tag 'for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: add MODULE_SOFTDEP to ensure crc32c is included in the initramfs
  ext4: fix bitmap position validation
  ext4: set h_journal if there is a failure starting a reserved handle
  ext4: prevent right-shifting extents beyond EXT_MAX_BLOCKS

<linux/stringhash.h>: fix end_name_hash() for 64bit long

The comment claims that this helper will try not to loose bits, but for
64bit long it looses the high bits before hashing 64bit long into 32bit
int.  Use the helper hash_long() to do the right thing for 64bit long.
For 32bit long, there is no change.

All the callers of end_name_hash() either assign the result to
qstr->hash, which is u32 or return the result as an int value (e.g.
full_name_hash()).  Change the helper return type to int to conform to
its users.

[ It took me a while to apply this, because my initial reaction to it
  was - incorrectly - that it could make for slower code.

  After having looked more at it, I take back all my complaints about
  the patch, Amir was right and I was mis-reading things or just being
  stupid.

  I also don't worry too much about the possible performance impact of
  this on 64-bit, since most architectures that actually care about
  performance end up not using this very much (the dcache code is the
  most performance-critical, but the word-at-a-time case uses its own
  hashing anyway).

  So this ends up being mostly used for filesystems that do their own
  degraded hashing (usually because they want a case-insensitive
  comparison function).

  A _tiny_ worry remains, in that not everybody uses DCACHE_WORD_ACCESS,
  and then this potentially makes things more expensive on 64-bit
  architectures with slow or lacking multipliers even for the normal
  case.

  That said, realistically the only such architecture I can think of is
  PA-RISC. Nobody really cares about performance on that, it's more of a
  "look ma, I've got warts^W an odd machine" platform.

  So the patch is fine, and all my initial worries were just misplaced
  from not looking at this properly.   - Linus ]

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS: add myself as maintainer of AFFS

The AFFS filesystem is still in use by m68k community (Link #2), but as
there was no code activity and no maintainer, the filesystem appeared on
the list of candidates for staging/removal (Link #1).

I volunteer to act as a maintainer of AFFS to collect any fixes that
might show up and to guard fs/affs/ against another spring cleaning.

Link: https://lkml.kernel.org/r/20180425154602.GA8546@bombadil.infradead.org
Link: https://lkml.kernel.org/r/1613268.lKBQxPXt8J@merkaba
CC: Martin Steigerwald <martin@lichtvoll.de>
CC: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'i2c/for-current' of git://git./linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:

- two driver fixes

- better parameter check for the core

- Documentation updates

- part of a tree-wide HAS_DMA cleanup

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: sprd: Fix the i2c count issue
  i2c: sprd: Prevent i2c accesses after suspend is called
  i2c: dev: prevent ZERO_SIZE_PTR deref in i2cdev_ioctl_rdwr()
  Documentation/i2c: adopt kernel commenting style in examples
  Documentation/i2c: sync docs with current state of i2c-tools
  Documentation/i2c: whitespace cleanup
  i2c: Remove depends on HAS_DMA in case of platform dependency

Merge branch 'linus' of git://git./linux/kernel/git/herbert/crypto-2.6

Pull crypto fixes from Herbert Xu:

- crypto API regression that may cause sporadic alloc failures

- double-free bug in drbg

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
crypto: drbg - set freed buffers to NULL
crypto: api - fix finding algorithm currently being tested

Merge tag '4.17-rc2-smb3' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
"A few security related fixes for SMB3, most importantly for SMB3.11
  encryption"

* tag '4.17-rc2-smb3' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: smbd: Avoid allocating iov on the stack
  cifs: smbd: Don't use RDMA read/write when signing is used
  SMB311: Fix reconnect
  SMB3: Fix 3.11 encryption to Windows and handle encrypted smb3 tcon
  CIFS: set *resp_buf_type to NO_BUFFER on error

Merge tag 'powerpc-4.17-4' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
"A bunch of fixes, mostly for existing code and going to stable.

  Our memory hot-unplug path wasn't flushing the cache before removing
  memory. That is a problem now that we are doing memory hotplug on bare
  metal.

  Three fixes for the NPU code that supports devices connected via
  NVLink (ie. GPUs). The main one tweaks the TLB flush algorithm to
  avoid soft lockups for large flushes.

  A fix for our memory error handling where we would loop infinitely,
  returning back to the bad access and hard lockup the CPU.

  Fixes for the OPAL RTC driver, which wasn't handling some error cases
  correctly.

  A fix for a hardlockup in the powernv cpufreq driver.

  And finally two fixes to our smp_send_stop(), required due to a recent
  change to use it on shutdown.

  Thanks to: Alistair Popple, Balbir Singh, Laurentiu Tudor, Mahesh
  Salgaonkar, Mark Hairgrove, Nicholas Piggin, Rashmica Gupta, Shilpasri
  G Bhat"

* tag 'powerpc-4.17-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/kvm/booke: Fix altivec related build break
  powerpc: Fix deadlock with multiple calls to smp_send_stop
  cpufreq: powernv: Fix hardlockup due to synchronous smp_call in timer interrupt
  powerpc: Fix smp_send_stop NMI IPI handling
  rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops
  powerpc/mce: Fix a bug where mce loops on memory UE.
  powerpc/powernv/npu: Do a PID GPU TLB flush when invalidating a large address range
  powerpc/powernv/npu: Prevent overwriting of pnv_npu2_init_contex() callback parameters
  powerpc/powernv/npu: Add lock to prevent race in concurrent context init/destroy
  powerpc/powernv/memtrace: Let the arch hotunplug code flush cache
  powerpc/mm: Flush cache on memory hot(un)plug

rMerge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Radim Krčmář:
"ARM:
   - PSCI selection API, a leftover from 4.16 (for stable)
   - Kick vcpu on active interrupt affinity change
   - Plug a VMID allocation race on oversubscribed systems
   - Silence debug messages
   - Update Christoffer's email address (linaro -> arm)

  x86:
   - Expose userspace-relevant bits of a newly added feature
   - Fix TLB flushing on VMX with VPID, but without EPT"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  x86/headers/UAPI: Move DISABLE_EXITS KVM capability bits to the UAPI
  kvm: apic: Flush TLB after APIC mode/address change if VPIDs are in use
  arm/arm64: KVM: Add PSCI version selection API
  KVM: arm/arm64: vgic: Kick new VCPU on interrupt migration
  arm64: KVM: Demote SVE and LORegion warnings to debug only
  MAINTAINERS: Update e-mail address for Christoffer Dall
  KVM: arm/arm64: Close VMID generation race

Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
"Nothing too bad, but the spectre updates to smatch identified a few
  places that may need sanitising so we've got those covered.

  Details:

   - Close some potential spectre-v1 vulnerabilities found by smatch

   - Add missing list sentinel for CPUs that don't require KPTI

   - Removal of unused 'addr' parameter for I/D cache coherency

   - Removal of redundant set_fs(KERNEL_DS) calls in ptrace

   - Fix single-stepping state machine handling in response to kernel
     traps

   - Clang support for 128-bit integers

   - Avoid instrumenting our out-of-line atomics in preparation for
     enabling LSE atomics by default in 4.18"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: avoid instrumenting atomic_ll_sc.o
  KVM: arm/arm64: vgic: fix possible spectre-v1 in vgic_mmio_read_apr()
  KVM: arm/arm64: vgic: fix possible spectre-v1 in vgic_get_irq()
  arm64: fix possible spectre-v1 in ptrace_hbp_get_event()
  arm64: support __int128 with clang
  arm64: only advance singlestep for user instruction traps
  arm64/kernel: rename module_emit_adrp_veneer->module_emit_veneer_for_adrp
  arm64: ptrace: remove addr_limit manipulation
  arm64: mm: drop addr parameter from sync icache and dcache
  arm64: add sentinel to kpti_safe_list

Merge tag 'modules-for-v4.17-rc3' of git://git./linux/kernel/git/jeyu/linux

Pull modules fix from Jessica Yu:
"Fix display of module section addresses in sysfs, which were getting
hashed with %pK and breaking tools like perf"

* tag 'modules-for-v4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
module: Fix display of wrong module .text address

Merge tag 'ceph-for-4.17-rc3' of git://github.com/ceph/ceph-client

Pull ceph fixes from Ilya Dryomov:
"A CephFS quota follow-up and fixes for two older issues in the
  messenger layer, marked for stable"

* tag 'ceph-for-4.17-rc3' of git://github.com/ceph/ceph-client:
  libceph: validate con->state at the top of try_write()
  libceph: reschedule a tick in finish_hunting()
  libceph: un-backoff on tick when we have a authenticated session
  ceph: check if mds create snaprealm when setting quota

Merge tag 'char-misc-4.17-rc3' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
"Here are some small char and misc driver fixes for 4.17-rc3

  A variety of small things that have fallen out after 4.17-rc1 was out.
  Some vboxguest fixes for systems with lots of memory, amba bus fixes,
  some MAINTAINERS updates, uio_hv_generic driver fixes, and a few other
  minor things that resolve problems that people reported.

  The amba bus fixes took twice to get right, the first time I messed up
  applying the patches in the wrong order, hence the revert and later
  addition again with the correct fix, sorry about that.

  All of these have been in linux-next with no reported issues"

* tag 'char-misc-4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  ARM: amba: Fix race condition with driver_override
  ARM: amba: Make driver_override output consistent with other buses
  Revert "ARM: amba: Fix race condition with driver_override"
  ARM: amba: Don't read past the end of sysfs "driver_override" buffer
  ARM: amba: Fix race condition with driver_override
  virt: vbox: Log an error when we fail to get the host version
  virt: vbox: Use __get_free_pages instead of kmalloc for DMA32 memory
  virt: vbox: Add vbg_req_free() helper function
  virt: vbox: Move declarations of vboxguest private functions to private header
  slimbus: Fix out-of-bounds access in slim_slicesize()
  MAINTAINERS: add dri-devel&linaro-mm for Android ION
  fpga-manager: altera-ps-spi: preserve nCONFIG state
  MAINTAINERS: update my email address
  uio_hv_generic: fix subchannel ring mmap
  uio_hv_generic: use correct channel in isr
  uio_hv_generic: make ring buffer attribute for primary channel
  uio_hv_generic: set size of ring buffer attribute
  ANDROID: binder: prevent transactions into own process.

Merge tag 'driver-core-4.17-rc3' of git://git./linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg Kroah-Hartman:
"Here are some small driver core and firmware fixes for 4.17-rc3

  There's a kobject WARN() removal to make syzkaller a lot happier about
  some "normal" error paths that it keeps hitting, which should reduce
  the number of false-positives we have been getting recently.

  There's also some fimware test and documentation fixes, and the
  coredump() function signature change that needed to happen after -rc1
  before drivers started to take advantage of it.

  All of these have been in linux-next with no reported issues"

* tag 'driver-core-4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  firmware: some documentation fixes
  selftests:firmware: fixes a call to a wrong function name
  kobject: don't use WARN for registration failures
  firmware: Fix firmware documentation for recent file renames
  test_firmware: fix setting old custom fw path back on exit, second try
  test_firmware: Install all scripts
  drivers: change struct device_driver::coredump() return type to void

Merge tag 'tty-4.17-rc3' of git://git./linux/kernel/git/gregkh/tty

Pull tty/serial fixes from Greg KH:
"Here are some tty and serial driver fixes for reported issues for
  4.17-rc3.

  Nothing major, but a number of small things:

   - device tree fixes/updates for serial ports

   - earlycon fixes

   - n_gsm fixes

   - tty core change reverted to help resolve syszkaller reports

   - other serial driver small fixes

  All of these have been in linux-next with no reported issues"

* tag 'tty-4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: Use __GFP_NOFAIL for tty_ldisc_get()
  tty: serial: xuartps: Setup early console when uartclk is also passed
  tty: Don't call panic() at tty_ldisc_init()
  tty: Avoid possible error pointer dereference at tty_ldisc_restore().
  dt-bindings: mvebu-uart: DT fix s/interrupts-names/interrupt-names/
  tty: serial: qcom_geni_serial: Use signed variable to get IRQ
  earlycon: Use a pointer table to fix __earlycon_table stride
  serial: sh-sci: Document r8a77470 bindings
  dt-bindings: meson-uart: DT fix s/clocks-names/clock-names/
  serial: imx: fix cached UCR2 read on software reset
  serial: imx: warn user when using unsupported configuration
  serial: mvebu-uart: Fix local flags handling on termios update
  tty: n_gsm: Fix DLCI handling for ADM mode if debug & 2 is not set
  tty: n_gsm: Fix long delays with control frame timeouts in ADM mode

x86/headers/UAPI: Move DISABLE_EXITS KVM capability bits to the UAPI

Move DISABLE_EXITS KVM capability bits to the UAPI just like the rest of
capabilities.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

Merge tag 'staging-4.17-rc3' of git://git./linux/kernel/git/gregkh/staging

Pull staging fixes from Greg KH:
"Here are two staging driver fixups for 4.17-rc3.

  The first is the remaining stragglers of the irda code removal that
  you pointed out during the merge window. The second is a fix for the
  wilc1000 driver due to a patch that got merged in 4.17-rc1.

  Both of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: wilc1000: fix NULL pointer exception in host_int_parse_assoc_resp_info()
  staging: irda: remove remaining remants of irda code removal

Merge tag 'usb-4.17-rc3' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
"Here are a number of USB driver fixes for reported problems for
  4.17-rc3.

  The "largest" here is a number of phy core changes for reported
  problems with the -rc1 release. There's also the usual musb and xhci
  fixes, as well as new device id updates. There are also some usbip
  fixes for reported problems as more people start to use that code with
  containers.

  All of these have been in linux-next with no reported issues, except
  the last few new device ids, which are "obviously correct" :)"

* tag 'usb-4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (26 commits)
  USB: musb: dsps: drop duplicate phy initialisation
  USB: musb: host: prevent core phy initialisation
  usb: core: phy: add the SPDX-License-Identifier and include guard
  xhci: Fix Kernel oops in xhci dbgtty
  usb: select USB_COMMON for usb role switch config
  usb: core: phy: add missing forward declaration for "struct device"
  usb: core: phy: make it a no-op if CONFIG_GENERIC_PHY is disabled
  usb: core: use phy_exit during suspend if wake up is not supported
  usb: core: split usb_phy_roothub_{init,alloc}
  usb: core: phy: fix return value of usb_phy_roothub_exit()
  usb: typec: ucsi: Increase command completion timeout value
  Revert "xhci: plat: Register shutdown for xhci_plat"
  usb: core: Add quirk for HP v222w 16GB Mini
  Documentation: typec.rst: Use literal-block element with ascii art
  usb: typec: ucsi: fix tracepoint related build error
  usbip: usbip_event: fix to not print kernel pointer address
  usbip: usbip_host: fix to hold parent lock for device_attach() calls
  usbip: vhci_hcd: Fix usb device and sockfd leaks
  usbip: vhci_hcd: check rhport before using in vhci_hub_control()
  USB: Increment wakeup count on remote wakeup.
  ...

Merge tag 'sound-4.17-rc3' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
"A significant amount of fixes have been piled up at this time.

   - Possible Spectre v1 coverage in OSS sequencer API, control API,
     HD-audio hwdep ioctl, ASIHPI hwdep ioctl, OPL3, and HDSPM/RME
     channel_info API.

   - A regression fix in PCM delay reporting that happened at the code
     refactoring for the set_fs() removal

   - The long-standing bug in PCM sync_ptr ioctl that missed the audio
     timestamp field

   - USB-audio regression fixes due to the recent UAC2 jack support

   - vm_fault_t conversions in a couple of places

   - ASoC topology API fixes

   - Assorted driver fixes:
      * ASoC rsnd, FSL, Intel SST, DMIC, AMD, ADAU17x1, Realtek codec
      * FireWire typo fix
      * HD-audio quirks and USB-audio Dell fixup
      * USB-audio UAC3 corrections"

* tag 'sound-4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (35 commits)
  ALSA: dice: fix error path to destroy initialized stream data
  ALSA: hda - Skip jack and others for non-existing PCM streams
  ALSA: hda/realtek - change the location for one of two front mics
  ALSA: rme9652: Hardening for potential Spectre v1
  ALSA: hdspm: Hardening for potential Spectre v1
  ALSA: asihpi: Hardening for potential Spectre v1
  ALSA: opl3: Hardening for potential Spectre v1
  ALSA: hda: Hardening for potential Spectre v1
  ALSA: control: Hardening for potential Spectre v1
  ALSA: seq: oss: Hardening for potential Spectre v1
  ALSA: seq: oss: Fix unbalanced use lock for synth MIDI device
  ALSA: hda/realtek - Update ALC255 depop optimize
  ALSA: hda/realtek - Add some fixes for ALC233
  ALSA: pcm: Change return type to vm_fault_t
  ALSA: usx2y: Change return type to vm_fault_t
  ALSA: usb-audio: ADC3: Fix channel mapping conversion for ADC3.
  ALSA: dice: fix OUI for TC group
  ALSA: usb-audio: Skip broken EU on Dell dock USB-audio
  ALSA: usb-audio: Fix missing endian conversion
  ALSA: usb-audio: Fix forgotten conversion of control query functions
  ...

Merge tag 'armsoc-fixes' of git://git./linux/kernel/git/arm/arm-soc

Pull ARM SoC fixes from Arnd Bergmann:
"This round of fixes has two larger changes that came in last week:

   - a couple of patches all intended to finally turn on USB support on
     various Amlogic SoC based boards. The respective driver were not
     finalized until very late before the merge window and the DT
     portion is the last bit now.

   - a defconfig update for gemini that had repeatedly missed the cut
     but that is required to actually boot any real machines with the
     default build.

  The rest are the usual small changes:

   - a fix for a nasty build regression on the OMAP memory drivers

   - a fix for a boot problem on Intel/Altera SocFPGA

   - a MAINTAINER file update

   - a couple of fixes for issues found by automated testing (kernelci,
     coverity, sparse, ...)

   - a few incorrect DT entries are updated to match the hardware"

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  ARM: defconfig: Update Gemini defconfig
  ARM: s3c24xx: jive: Fix some GPIO names
  HISI LPC: Add Kconfig MFD_CORE dependency
  ARM: dts: Fix NAS4220B pin config
  MAINTAINERS: Remove myself as maintainer
  arm64: dts: correct SATA addresses for Stingray
  ARM64: dts: meson-gxm-khadas-vim2: enable the USB controller
  ARM64: dts: meson-gxl-nexbox-a95x: enable the USB controller
  ARM64: dts: meson-gxl-s905x-libretech-cc: enable the USB controller
  ARM64: dts: meson-gx-p23x-q20x: enable the USB controller
  ARM64: dts: meson-gxl-s905x-p212: enable the USB controller
  ARM64: dts: meson-gxm: add GXM specific USB host configuration
  ARM64: dts: meson-gxl: add USB host support
  ARM: OMAP2+: Fix build when using split object directories
  soc: bcm2835: Make !RASPBERRYPI_FIRMWARE dummies return failure
  soc: bcm: raspberrypi-power: Fix use of __packed
  ARM: dts: Fix cm2 and prm sizes for omap4
  ARM: socfpga_defconfig: Remove QSPI Sector 4K size force
  firmware: arm_scmi: remove redundant null check on array
  arm64: dts: juno: drop unnecessary address-cells and size-cells properties

Merge tag 'mtd/fixes-for-4.17-rc3' of git://git.infradead.org/linux-mtd

Pull mtd fixes from Boris Brezillon:

- Fix nanddev_mtd_erase() function to match the changes done in
   e7bfb3fdbde3 ("mtd: Stop updating erase_info->state and calling
   mtd_erase_callback()")

- Fix a memory leak in the Tango NAND controller driver

- Fix read/write to a suspended erase block in the CFI driver

- Fix the DT parsing logic in the Marvell NAND controller driver

* tag 'mtd/fixes-for-4.17-rc3' of git://git.infradead.org/linux-mtd:
  mtd: rawnand: marvell: fix the chip-select DT parsing logic
  mtd: cfi: cmdset_0002: Do not allow read/write to suspend erase block.
  mtd: cfi: cmdset_0001: Workaround Micron Erase suspend bug.
  mtd: cfi: cmdset_0001: Do not allow read/write to suspend erase block.
  mtd: spi-nor: cadence-quadspi: Fix page fault kernel panic
  mtd: nand: Fix nanddev_mtd_erase()
  mtd: rawnand: tango: Fix struct clk memory leak

Merge tag 'drm-fixes-for-v4.17-rc3' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
"Pretty run of the mill for this stage in the cycle: msm, i915, amdgpu,
  qxl, virtio-gpu, sun4i fixes.

  i915:
   - Black screen fixes
   - Display w/a fix
   - HDA codec interop fix

  sun4i:
   - tbsa711 tablet regression fix

  qxl:
   - Regression fixes due to changes in TTM

  virtio:
   - Fix wait event condition

  msm:
   - DSI display fixes

  amdgpu:
   - fix hang on Carrizo
   - DP MST hang fixes
   - irq handling deadlock in DC.

  amdkfd:
   - Fix Kconfig issue
   - Clock retrieval fix
   - Sparse fixes"

* tag 'drm-fixes-for-v4.17-rc3' of git://people.freedesktop.org/~airlied/linux: (27 commits)
  drm/edid: Reset more of the display info
  drm/virtio: fix vq wait_event condition
  qxl: keep separate release_bo pointer
  qxl: fix qxl_release_{map,unmap}
  Revert "drm/sun4i: add lvds mode_valid function"
  drm/amd/display: Check dc_sink every time in MST hotplug
  drm/amd/display: Update MST edid property every time
  drm/amd/display: Don't read EDID in atomic_check
  drm/amd/display: Disallow enabling CRTC without primary plane with FB
  drm/amd/display: Fix deadlock when flushing irq
  drm/i915/fbdev: Enable late fbdev initial configuration
  drm/i915: Use ktime on wait_for
  drm/amdgpu: set COMPUTE_PGM_RSRC1 for SGPR/VGPR clearing shaders
  drm/amdkfd: fix build, select MMU_NOTIFIER
  drm/amdkfd: fix clock counter retrieval for node without GPU
  drm/amdkfd: Fix the error return code in kfd_ioctl_unmap_memory_from_gpu()
  drm/amdkfd: kfd_dev_is_large_bar() can be static
  drm/i915: Enable display WA#1183 from its correct spot
  drm/i915/audio: set minimum CD clock to twice the BCLK
  drm/msm: don't deref error pointer in the msm_fbdev_create error path
  ...

kvm: apic: Flush TLB after APIC mode/address change if VPIDs are in use

Currently, KVM flushes the TLB after a change to the APIC access page
address or the APIC mode when EPT mode is enabled. However, even in
shadow paging mode, a TLB flush is needed if VPIDs are being used, as
specified in the Intel SDM Section 29.4.5.

So replace vmx_flush_tlb_ept_only() with vmx_flush_tlb(), which will
flush if either EPT or VPIDs are in use.

Signed-off-by: Junaid Shahid <junaids@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

x86/entry/64/compat: Preserve r8-r11 in int $0x80

32-bit user code that uses int $80 doesn't care about r8-r11.  There is,
however, some 64-bit user code that intentionally uses int $0x80 to invoke
32-bit system calls.  From what I've seen, basically all such code assumes
that r8-r15 are all preserved, but the kernel clobbers r8-r11.  Since I
doubt that there's any code that depends on int $0x80 zeroing r8-r11,
change the kernel to preserve them.

I suspect that very little user code is broken by the old clobber, since
r8-r11 are only rarely allocated by gcc, and they're clobbered by function
calls, so they only way we'd see a problem is if the same function that
invokes int $0x80 also spills something important to one of these
registers.

The current behavior seems to date back to the historical commit
"[PATCH] x86-64 merge for 2.6.4".  Before that, all regs were
preserved.  I can't find any explanation of why this change was made.

Update the test_syscall_vdso_32 testcase as well to verify the new
behavior, and it strengthens the test to make sure that the kernel doesn't
accidentally permute r8..r15.

Suggested-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Link: https://lkml.kernel.org/r/d4c4d9985fbe64f8c9e19291886453914b48caee.1523975710.git.luto@kernel.org

x86/ipc: Fix x32 version of shmid64_ds and msqid64_ds

A bugfix broke the x32 shmid64_ds and msqid64_ds data structure layout
(as seen from user space) a few years ago: Originally, __BITS_PER_LONG
was defined as 64 on x32, so we did not have padding after the 64-bit
__kernel_time_t fields, After __BITS_PER_LONG got changed to 32,
applications would observe extra padding.

In other parts of the uapi headers we seem to have a mix of those
expecting either 32 or 64 on x32 applications, so we can't easily revert
the path that broke these two structures.

Instead, this patch decouples x32 from the other architectures and moves
it back into arch specific headers, partially reverting the even older
commit 73a2d096fdf2 ("x86: remove all now-duplicate header files").

It's not clear whether this ever made any difference, since at least
glibc carries its own (correct) copy of both of these header files,
so possibly no application has ever observed the definitions here.

Based on a suggestion from H.J. Lu, I tried out the tool from
https://github.com/hjl-tools/linux-header to find other such
bugs, which pointed out the same bug in statfs(), which also has
a separate (correct) copy in glibc.

Fixes: f4b4aae18288 ("x86/headers/uapi: Fix __BITS_PER_LONG value for x32 builds")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H . J . Lu" <hjl.tools@gmail.com>
Cc: Jeffrey Walton <noloader@gmail.com>
Cc: stable@vger.kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20180424212013.3967461-1-arnd@arndb.de

x86/setup: Do not reserve a crash kernel region if booted on Xen PV

Xen PV domains cannot shut down and start a crash kernel. Instead,
the crashing kernel makes a SCHEDOP_shutdown hypercall with the
reason code SHUTDOWN_crash, cf. xen_crash_shutdown() machine op in
arch/x86/xen/enlighten_pv.c.

A crash kernel reservation is merely a waste of RAM in this case. It
may also confuse users of kexec_load(2) and/or kexec_file_load(2).
When flags include KEXEC_ON_CRASH or KEXEC_FILE_ON_CRASH,
respectively, these syscalls return success, which is technically
correct, but the crash kexec image will never be actually used.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Dou Liyang <douly.fnst@cn.fujitsu.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: xen-devel@lists.xenproject.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Jean Delvare <jdelvare@suse.de>
Link: https://lkml.kernel.org/r/20180425120835.23cef60c@ezekiel.suse.cz