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Commit a894a8a5 authored by Randy Dunlap's avatar Randy Dunlap Committed by Jonathan Corbet
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Documentation: kernel-parameters: sort all "no..." parameters 

Sort all of the "no..." kernel parameters into the correct order
as specified in kernel-parameters.rst: "into English Dictionary order
(defined as ignoring all punctuation and sorting digits before letters
in a case insensitive manner)".

No other changes here, just movement of lines.
Signed-off-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230317002635.16540-1-rdunlap@infradead.orgSigned-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent c1f8e848
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Documentation/admin-guide/kernel-parameters.txt
View file @ a894a8a5
......@@ -929,9 +929,6 @@
debug_objects [KNL] Enable object debugging
no_debug_objects
[KNL] Disable object debugging
debug_guardpage_minorder=
[KNL] When CONFIG_DEBUG_PAGEALLOC is set, this
parameter allows control of the order of pages that will
......@@ -3579,7 +3576,21 @@
no5lvl [X86-64] Disable 5-level paging mode. Forces
kernel to use 4-level paging instead.
nofsgsbase [X86] Disables FSGSBASE instructions.
noaliencache [MM, NUMA, SLAB] Disables the allocation of alien
caches in the slab allocator. Saves per-node memory,
but will impact performance.
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.
noautogroup Disable scheduler automatic task group creation.
nocache [ARM]
no_console_suspend
[HW] Never suspend the console
......@@ -3596,32 +3607,8 @@
/sys/module/printk/parameters/console_suspend) to
turn on/off it dynamically.
novmcoredd [KNL,KDUMP]
Disable device dump. Device dump allows drivers to
append dump data to vmcore so you can collect driver
specified debug info. Drivers can append the data
without any limit and this data is stored in memory,
so this may cause significant memory stress. Disabling
device dump can help save memory but the driver debug
data will be no longer available. This parameter
is only available when CONFIG_PROC_VMCORE_DEVICE_DUMP
is set.
noaliencache [MM, NUMA, SLAB] Disables the allocation of alien
caches in the slab allocator. Saves per-node memory,
but will impact performance.
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.
noautogroup Disable scheduler automatic task group creation.
nocache [ARM]
no_debug_objects
[KNL] Disable object debugging
nodsp [SH] Disable hardware DSP at boot time.
......@@ -3631,14 +3618,6 @@
noexec [IA-64]
nosmap [PPC]
Disable SMAP (Supervisor Mode Access Prevention)
even if it is supported by processor.
nosmep [PPC64s]
Disable SMEP (Supervisor Mode Execution Prevention)
even if it is supported by processor.
noexec32 [X86-64]
This affects only 32-bit executables.
noexec32=on: enable non-executable mappings (default)
......@@ -3646,74 +3625,18 @@
noexec32=off: disable non-executable mappings
read implies executable mappings
no_file_caps Tells the kernel not to honor file capabilities. The
only way then for a file to be executed with privilege
is to be setuid root or executed by root.
nofpu [MIPS,SH] Disable hardware FPU at boot time.
nofsgsbase [X86] Disables FSGSBASE instructions.
nofxsr [BUGS=X86-32] Disables x86 floating point extended
register save and restore. The kernel will only save
legacy floating-point registers on task switch.
nohugeiomap [KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
nohugevmalloc [KNL,X86,PPC,ARM64] Disable kernel huge vmalloc mappings.
nosmt [KNL,S390] Disable symmetric multithreading (SMT).
Equivalent to smt=1.
[KNL,X86] Disable symmetric multithreading (SMT).
nosmt=force: Force disable SMT, cannot be undone
via the sysfs control file.
nospectre_v1 [X86,PPC] Disable mitigations for Spectre Variant 1
(bounds check bypass). With this option data leaks are
possible in the system.
nospectre_v2 [X86,PPC_E500,ARM64] Disable all mitigations for
the Spectre variant 2 (indirect branch prediction)
vulnerability. System may allow data leaks with this
option.
nospectre_bhb [ARM64] Disable all mitigations for Spectre-BHB (branch
history injection) vulnerability. System may allow data leaks
with this option.
nospec_store_bypass_disable
[HW] Disable all mitigations for the Speculative Store Bypass vulnerability
no_uaccess_flush
[PPC] Don't flush the L1-D cache after accessing user data.
noxsave [BUGS=X86] Disables x86 extended register state save
and restore using xsave. The kernel will fallback to
enabling legacy floating-point and sse state.
noxsaveopt [X86] Disables xsaveopt used in saving x86 extended
register states. The kernel will fall back to use
xsave to save the states. By using this parameter,
performance of saving the states is degraded because
xsave doesn't support modified optimization while
xsaveopt supports it on xsaveopt enabled systems.
noxsaves [X86] Disables xsaves and xrstors used in saving and
restoring x86 extended register state in compacted
form of xsave area. The kernel will fall back to use
xsaveopt and xrstor to save and restore the states
in standard form of xsave area. By using this
parameter, xsave area per process might occupy more
memory on xsaves enabled systems.
nohlt [ARM,ARM64,MICROBLAZE,SH] Forces the kernel to busy wait
in do_idle() and not use the arch_cpu_idle()
implementation; requires CONFIG_GENERIC_IDLE_POLL_SETUP
to be effective. This is useful on platforms where the
sleep(SH) or wfi(ARM,ARM64) instructions do not work
correctly or when doing power measurements to evaluate
the impact of the sleep instructions. This is also
useful when using JTAG debugger.
no_file_caps Tells the kernel not to honor file capabilities. The
only way then for a file to be executed with privilege
is to be setuid root or executed by root.
nohalt [IA-64] Tells the kernel not to use the power saving
function PAL_HALT_LIGHT when idle. This increases
power-consumption. On the positive side, it reduces
......@@ -3737,6 +3660,19 @@
nohibernate [HIBERNATION] Disable hibernation and resume.
nohlt [ARM,ARM64,MICROBLAZE,SH] Forces the kernel to busy wait
in do_idle() and not use the arch_cpu_idle()
implementation; requires CONFIG_GENERIC_IDLE_POLL_SETUP
to be effective. This is useful on platforms where the
sleep(SH) or wfi(ARM,ARM64) instructions do not work
correctly or when doing power measurements to evaluate
the impact of the sleep instructions. This is also
useful when using JTAG debugger.
nohugeiomap [KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
nohugevmalloc [KNL,X86,PPC,ARM64] Disable kernel huge vmalloc mappings.
nohz= [KNL] Boottime enable/disable dynamic ticks
Valid arguments: on, off
Default: on
......@@ -3754,16 +3690,6 @@
Note that this argument takes precedence over
the CONFIG_RCU_NOCB_CPU_DEFAULT_ALL option.
noiotrap [SH] Disables trapped I/O port accesses.
noirqdebug [X86-32] Disables the code which attempts to detect and
disable unhandled interrupt sources.
no_timer_check [X86,APIC] Disables the code which tests for
broken timer IRQ sources.
noisapnp [ISAPNP] Disables ISA PnP code.
noinitrd [RAM] Tells the kernel not to load any configured
initial RAM disk.
......@@ -3775,6 +3701,13 @@
noinvpcid [X86] Disable the INVPCID cpu feature.
noiotrap [SH] Disables trapped I/O port accesses.
noirqdebug [X86-32] Disables the code which attempts to detect and
disable unhandled interrupt sources.
noisapnp [ISAPNP] Disables ISA PnP code.
nojitter [IA-64] Disables jitter checking for ITC timers.
nokaslr [KNL]
......@@ -3782,18 +3715,10 @@
kernel and module base offset ASLR (Address Space
Layout Randomization).
no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
fault handling.
no-vmw-sched-clock
[X86,PV_OPS] Disable paravirtualized VMware scheduler
clock and use the default one.
no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES] Disable paravirtualized
steal time accounting. steal time is computed, but
won't influence scheduler behaviour
no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
nolapic [X86-32,APIC] Do not enable or use the local APIC.
......@@ -3806,10 +3731,6 @@
nomfgpt [X86-32] Disable Multi-Function General Purpose
Timer usage (for AMD Geode machines).
nonmi_ipi [X86] Disable using NMI IPIs during panic/reboot to
shutdown the other cpus. Instead use the REBOOT_VECTOR
irq.
nomodeset Disable kernel modesetting. Most systems' firmware
sets up a display mode and provides framebuffer memory
for output. With nomodeset, DRM and fbdev drivers will
......@@ -3822,6 +3743,10 @@
nomodule Disable module load
nonmi_ipi [X86] Disable using NMI IPIs during panic/reboot to
shutdown the other cpus. Instead use the REBOOT_VECTOR
irq.
nopat [X86] Disable PAT (page attribute table extension of
pagetables) support.
......@@ -3830,6 +3755,9 @@
nopku [X86] Disable Memory Protection Keys CPU feature found
in some Intel CPUs.
nopti [X86-64]
Equivalent to pti=off
nopv= [X86,XEN,KVM,HYPER_V,VMWARE]
Disables the PV optimizations forcing the guest to run
as generic guest with no PV drivers. Currently support
......@@ -3849,21 +3777,77 @@
noresume [SWSUSP] Disables resume and restores original swap
space.
nosbagart [IA-64]
no-scroll [VGA] Disables scrollback.
This is required for the Braillex ib80-piezo Braille
reader made by F.H. Papenmeier (Germany).
nosbagart [IA-64]
nosgx [X86-64,SGX] Disables Intel SGX kernel support.
nosmap [PPC]
Disable SMAP (Supervisor Mode Access Prevention)
even if it is supported by processor.
nosmep [PPC64s]
Disable SMEP (Supervisor Mode Execution Prevention)
even if it is supported by processor.
nosmp [SMP] Tells an SMP kernel to act as a UP kernel,
and disable the IO APIC. legacy for "maxcpus=0".
nosmt [KNL,S390] Disable symmetric multithreading (SMT).
Equivalent to smt=1.
[KNL,X86] Disable symmetric multithreading (SMT).
nosmt=force: Force disable SMT, cannot be undone
via the sysfs control file.
nosoftlockup [KNL] Disable the soft-lockup detector.
nospec_store_bypass_disable
[HW] Disable all mitigations for the Speculative Store Bypass vulnerability
nospectre_bhb [ARM64] Disable all mitigations for Spectre-BHB (branch
history injection) vulnerability. System may allow data leaks
with this option.
nospectre_v1 [X86,PPC] Disable mitigations for Spectre Variant 1
(bounds check bypass). With this option data leaks are
possible in the system.
nospectre_v2 [X86,PPC_E500,ARM64] Disable all mitigations for
the Spectre variant 2 (indirect branch prediction)
vulnerability. System may allow data leaks with this
option.
no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES] Disable paravirtualized
steal time accounting. steal time is computed, but
won't influence scheduler behaviour
nosync [HW,M68K] Disables sync negotiation for all devices.
no_timer_check [X86,APIC] Disables the code which tests for
broken timer IRQ sources.
no_uaccess_flush
[PPC] Don't flush the L1-D cache after accessing user data.
novmcoredd [KNL,KDUMP]
Disable device dump. Device dump allows drivers to
append dump data to vmcore so you can collect driver
specified debug info. Drivers can append the data
without any limit and this data is stored in memory,
so this may cause significant memory stress. Disabling
device dump can help save memory but the driver debug
data will be no longer available. This parameter
is only available when CONFIG_PROC_VMCORE_DEVICE_DUMP
is set.
no-vmw-sched-clock
[X86,PV_OPS] Disable paravirtualized VMware scheduler
clock and use the default one.
nowatchdog [KNL] Disable both lockup detectors, i.e.
soft-lockup and NMI watchdog (hard-lockup).
......@@ -3875,6 +3859,25 @@
LEGACY_XAPIC_DISABLED bit set in the
IA32_XAPIC_DISABLE_STATUS MSR.
noxsave [BUGS=X86] Disables x86 extended register state save
and restore using xsave. The kernel will fallback to
enabling legacy floating-point and sse state.
noxsaveopt [X86] Disables xsaveopt used in saving x86 extended
register states. The kernel will fall back to use
xsave to save the states. By using this parameter,
performance of saving the states is degraded because
xsave doesn't support modified optimization while
xsaveopt supports it on xsaveopt enabled systems.
noxsaves [X86] Disables xsaves and xrstors used in saving and
restoring x86 extended register state in compacted
form of xsave area. The kernel will fall back to use
xsaveopt and xrstor to save and restore the states
in standard form of xsave area. By using this
parameter, xsave area per process might occupy more
memory on xsaves enabled systems.
nps_mtm_hs_ctr= [KNL,ARC]
This parameter sets the maximum duration, in
cycles, each HW thread of the CTOP can run
......@@ -4582,9 +4585,6 @@
Not specifying this option is equivalent to pti=auto.
nopti [X86-64]
Equivalent to pti=off
pty.legacy_count=
[KNL] Number of legacy pty's. Overwrites compiled-in
default number.
......
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