Merge tag 'docs-4.15-2' of git://git.lwn.net/linux

[platform/kernel/linux-starfive.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index a053212..b442172 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -709,6 +709,9 @@
                        It will be ignored when crashkernel=X,high is not used
                        or memory reserved is below 4G.
 
+       crossrelease_fullstack
+                       [KNL] Allow to record full stack trace in cross-release
+
        cryptomgr.notests
                         [KNL] Disable crypto self-tests
 
@@ -854,7 +857,7 @@
                        The filter can be disabled or changed to another
                        driver later using sysfs.
 
-       drm_kms_helper.edid_firmware=[<connector>:]<file>[,[<connector>:]<file>]
+       drm.edid_firmware=[<connector>:]<file>[,[<connector>:]<file>]
                        Broken monitors, graphic adapters, KVMs and EDIDless
                        panels may send no or incorrect EDID data sets.
                        This parameter allows to specify an EDID data sets
@@ -1713,6 +1716,13 @@
        irqaffinity=    [SMP] Set the default irq affinity mask
                        The argument is a cpu list, as described above.
 
+       irqchip.gicv2_force_probe=
+                       [ARM, ARM64]
+                       Format: <bool>
+                       Force the kernel to look for the second 4kB page
+                       of a GICv2 controller even if the memory range
+                       exposed by the device tree is too small.
+
        irqfixup        [HW]
                        When an interrupt is not handled search all handlers
                        for it. Intended to get systems with badly broken
@@ -1727,20 +1737,33 @@
        isapnp=         [ISAPNP]
                        Format: <RDP>,<reset>,<pci_scan>,<verbosity>
 
-       isolcpus=       [KNL,SMP] Isolate CPUs from the general scheduler.
-                       The argument is a cpu list, as described above.
+       isolcpus=       [KNL,SMP] Isolate a given set of CPUs from disturbance.
+                       [Deprecated - use cpusets instead]
+                       Format: [flag-list,]<cpu-list>
+
+                       Specify one or more CPUs to isolate from disturbances
+                       specified in the flag list (default: domain):
+
+                       nohz
+                         Disable the tick when a single task runs.
+                       domain
+                         Isolate from the general SMP balancing and scheduling
+                         algorithms. Note that performing domain isolation this way
+                         is irreversible: it's not possible to bring back a CPU to
+                         the domains once isolated through isolcpus. It's strongly
+                         advised to use cpusets instead to disable scheduler load
+                         balancing through the "cpuset.sched_load_balance" file.
+                         It offers a much more flexible interface where CPUs can
+                         move in and out of an isolated set anytime.
+
+                         You can move a process onto or off an "isolated" CPU via
+                         the CPU affinity syscalls or cpuset.
+                         <cpu number> begins at 0 and the maximum value is
+                         "number of CPUs in system - 1".
+
+                       The format of <cpu-list> is described above.
 
-                       This option can be used to specify one or more CPUs
-                       to isolate from the general SMP balancing and scheduling
-                       algorithms. You can move a process onto or off an
-                       "isolated" CPU via the CPU affinity syscalls or cpuset.
-                       <cpu number> begins at 0 and the maximum value is
-                       "number of CPUs in system - 1".
 
-                       This option is the preferred way to isolate CPUs. The
-                       alternative -- manually setting the CPU mask of all
-                       tasks in the system -- can cause problems and
-                       suboptimal load balancer performance.
 
        iucv=           [HW,NET]
 
@@ -1841,13 +1864,6 @@
                        Built with CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y,
                        the default is off.
 
-       kmemcheck=      [X86] Boot-time kmemcheck enable/disable/one-shot mode
-                       Valid arguments: 0, 1, 2
-                       kmemcheck=0 (disabled)
-                       kmemcheck=1 (enabled)
-                       kmemcheck=2 (one-shot mode)
-                       Default: 2 (one-shot mode)
-
        kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs.
                        Default is 0 (don't ignore, but inject #GP)
 
@@ -2548,6 +2564,9 @@
 
        noalign         [KNL,ARM]
 
+       noaltinstr      [S390] Disables alternative instructions patching
+                       (CPU alternatives feature).
+
        noapic          [SMP,APIC] Tells the kernel to not make use of any
                        IOAPICs that may be present in the system.
 
@@ -3185,6 +3204,10 @@
                        allowed (eg kernel_enable_fpu()/kernel_disable_fpu()).
                        There is some performance impact when enabling this.
 
+       ppc_tm=         [PPC]
+                       Format: {"off"}
+                       Disable Hardware Transactional Memory
+
        print-fatal-signals=
                        [KNL] debug: print fatal signals
 
@@ -3541,6 +3564,9 @@
        rcutorture.stall_cpu_holdoff= [KNL]
                        Time to wait (s) after boot before inducing stall.
 
+       rcutorture.stall_cpu_irqsoff= [KNL]
+                       Disable interrupts while stalling if set.
+
        rcutorture.stat_interval= [KNL]
                        Time (s) between statistics printk()s.
 
@@ -4202,6 +4228,9 @@
                        Used to run time disable IRQ_TIME_ACCOUNTING on any
                        platforms where RDTSC is slow and this accounting
                        can add overhead.
+                       [x86] unstable: mark the TSC clocksource as unstable, this
+                       marks the TSC unconditionally unstable at bootup and
+                       avoids any further wobbles once the TSC watchdog notices.
 
        turbografx.map[2|3]=    [HW,JOY]
                        TurboGraFX parallel port interface