Lines Matching +full:ptp +full:- +full:timer
16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nospcr -- disable console in ACPI SPCR table as
41 If set to vendor, prefer vendor-specific driver
73 Documentation/firmware-guide/acpi/debug.rst for more information about
131 Format: <byte> or <bitmap-list>
134 Disable auto-serialization of AML methods
137 auto-serialization feature.
155 Ignore the ACPI-based watchdog interface (WDAT) and let
176 acpi_osi=! # disable all built-in OS vendor
178 acpi_osi=!! # enable all built-in OS vendor
240 For broken nForce2 BIOS resulting in XT-PIC timer.
249 as soon as the kernel's real-mode entry point is called.
274 Use timer override. For some broken Nvidia NF5 boards
275 that require a timer override, but don't have HPET
287 See Documentation/sound/alsa-configuration.rst
294 align_va_addr= [X86-64]
299 CPU-intensive style benchmark, and it can vary highly in
302 32: only for 32-bit processes
303 64: only for 64-bit processes
304 on: enable for both 32- and 64-bit processes
305 off: disable for both 32- and 64-bit processes
315 Allow execve() of 32-bit applications and setting of the
317 subset of the CPUs support 32-bit EL0. When this
318 parameter is present, the set of CPUs supporting 32-bit
320 and hot-unplug operations may be restricted.
322 See Documentation/arch/arm64/asymmetric-32bit.rst for more
325 amd_iommu= [HW,X86-64]
328 fullflush - Deprecated, equivalent to iommu.strict=1
329 off - do not initialize any AMD IOMMU found in
331 force_isolation - Force device isolation for all
336 force_enable - Force enable the IOMMU on platforms known
339 pgtbl_v1 - Use v1 page table for DMA-API (Default).
340 pgtbl_v2 - Use v2 page table for DMA-API.
341 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
342 nohugepages - Limit page-sizes used for v1 page-tables
344 v2_pgsizes_only - Limit page-sizes used for v1 page-tables
348 amd_iommu_dump= [HW,X86-64]
354 amd_iommu_intr= [HW,X86-64]
357 legacy - Use legacy interrupt remapping mode.
358 vapic - Use virtual APIC mode, which allows IOMMU
360 This mode requires kvm-amd.avic=1.
389 Disable amd-pstate preferred core.
402 Power management functions (SPARCstation-4/5 + deriv.)
404 Disable APC CPU standby support. SPARCstation-Fox does
405 not play well with APC CPU idle - disable it if you have
412 when initialising the APIC and IO-APIC components.
413 For X86-32, this can also be used to specify an APIC
436 0 -- disable.
437 1 -- enable.
440 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
488 audit= [KNL] Enable the audit sub-system
490 0 | off - kernel audit is disabled and can not be
492 unset - kernel audit is initialized but disabled and
494 1 | on - kernel audit is initialized and partially
507 0 - Disable the BAU.
508 1 - Enable the BAU.
509 unset - Disable the BAU.
548 See Documentation/block/cmdline-partition.rst
562 See Documentation/admin-guide/bootconfig.rst
567 bttv.pll= See Documentation/admin-guide/media/bttv.rst
576 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
595 inclusive. See arch/mips/include/asm/pgtable-bits.h
605 - foo isn't auto-mounted if you mount all cgroups in
607 - foo isn't visible as an individually mountable
609 - if foo is an optional feature then the feature is
615 Specifying "pressure" disables per-cgroup pressure
633 nosocket -- Disable socket memory accounting.
634 nokmem -- Disable kernel memory accounting.
635 nobpf -- Disable BPF memory accounting.
640 0 -- check protection applied by kernel (includes
642 1 -- check protection requested by application.
654 numbers X. Note the Linux-specific bits are not necessarily
655 stable over kernel options, but the vendor-specific
675 force such clocks to be always-on nor does it reserve
679 information, see Documentation/driver-api/clk.rst.
681 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
698 [X86-32] pit,hpet,tsc;
705 [X86-64] hpet,tsc
711 architected timer so that code using WFE-based polling
725 clocksource-wdtest.holdoff= [KNL]
731 cma=nn[MG]@[start[MG][-end[MG]]]
742 Sets the size of kernel per-numa memory area for
744 per-numa CMA altogether. And If this option is not
746 With per-numa CMA enabled, DMA users on node nid will
773 com20020= [HW,NET] ARCnet - COM20020 chipset
777 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
781 ARCnet - COM90xx chipset (memory-mapped buffers)
810 See Documentation/admin-guide/serial-console.rst for more
825 $ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
826 /sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
839 Start an early, polled-mode console on the 8250/16550
842 MMIO inter-register address stride is either 8-bit
843 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
847 the h/w is not re-initialized.
874 syscall, or to executing "dmesg -S --raw" or to reading
878 seconds. A value of 0 disables the blank timer.
898 disable the cpuidle sub-system
904 disable the cpufreq sub-system
912 [X86,EARLY] Delay for N microsec between assert and de-assert
924 Run kdump after running panic-notifiers and dumping
937 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
940 See Documentation/admin-guide/kdump/kdump.rst for further details.
945 start-[end] where start and end are both
947 Documentation/admin-guide/kdump/kdump.rst for an example.
950 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
958 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
964 for 32-bit devices won't run out. Kernel would try to allocate
967 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
968 --> arm64: 128MiB
969 --> riscv: 128MiB
970 --> loongarch: 128MiB
978 [KNL] Disable crypto self-tests
986 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
1001 See also Documentation/input/devices/joystick-parport.rst
1014 [KNL] verbose locking self-tests
1017 self-tests.
1019 (no extra messages), setting it to -1 (all bits set)
1020 will print _a_lot_ more information - normally only
1055 Format: { on, no-mount, off }
1057 no-mount:
1062 get a -EPERM as result when trying to register files
1066 Default value is set in build-time with a kernel configuration.
1078 Documentation/admin-guide/mm/hugetlbpage.rst.
1092 delayacct [KNL] Enable per-task delay accounting
1172 Disable PIN 1 of APIC timer
1182 entries for DMA-API debugging code. One entry is
1183 required per DMA-API allocation. Use this if the
1184 DMA-API debugging code disables itself because the
1188 With this option the DMA-API debugging driver
1212 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1237 Control how the dt_cpu_ftrs device-tree binding is
1247 what data is available or for reverse-engineering.
1252 Documentation/admin-guide/dynamic-debug-howto.rst
1263 determined by stdout-path property in device tree's
1268 Start an early, polled-mode console on a Cadence
1279 Start an early, polled-mode console on the 8250/16550
1281 MMIO inter-register address stride is either 8-bit
1282 (mmio) or 32-bit (mmio32 or mmio32be).
1292 Start an early, polled-mode console on a pl011 serial
1296 the driver will use only 32-bit accessors to read/write
1305 Start an early, polled-mode console on a meson serial
1311 Start an early, polled-mode console on an msm serial
1317 Start an early, polled-mode console on an msm serial
1323 Start an early, polled-mode console on a serial port
1329 Start an early, polled-mode console on a serial port
1335 Use RISC-V SBI (Supervisor Binary Interface) for early
1353 Start an early, polled-mode console on a lantiq serial
1367 Start an early, polled-mode, output-only console on the
1372 Start an early, polled-mode console on the
1378 Start an early, polled-mode console on a Qualcomm
1386 coherent non-x86 systems that use system memory for
1485 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1502 elanfreq= [X86-32]
1510 See Documentation/admin-guide/kdump/kdump.rst for details.
1518 Enable PIN 1 of APIC timer
1526 0 -- permissive (log only, no denials).
1527 1 -- enforcing (deny and log).
1563 See also Documentation/fault-injection/.
1567 See Documentation/admin-guide/sysctl/net.rst for
1571 See Documentation/admin-guide/blockdev/floppy.rst.
1573 forcepae [X86-32]
1580 fred= [X86-64]
1631 ftrace_filter=[function-list]
1633 tracer at boot up. function-list is a comma-separated
1638 ftrace_notrace=[function-list]
1640 function-list. This list can be changed at run time
1644 ftrace_graph_filter=[function-list]
1647 function-list is a comma-separated list of functions
1651 ftrace_graph_notrace=[function-list]
1653 function-list. This list is a comma-separated list of
1673 off -- Don't create device links from firmware info.
1674 permissive -- Create device links from firmware info
1677 on -- Create device links from firmware info and use it
1679 rpm -- Like "on", but also use to order runtime PM.
1692 strict -- Default. Continue waiting on consumers to
1694 timeout -- Give up waiting on consumers and call
1704 See also Documentation/input/devices/joystick-parport.rst
1708 gart_fix_e820= [X86-64,EARLY] disable the fix e820 for K8 GART
1732 gcov_persist= [GCOV] When non-zero (default), profiling data for
1742 gpio-mockup.gpio_mockup_ranges
1745 gpio-mockup.gpio_mockup_named_lines
1777 against bounds-checking flaws in the kernel's
1783 [KNL] Should the hard-lockup detector generate
1789 for 64-bit NUMA, off otherwise.
1797 corresponding firmware-first mode error processing
1807 during restoration read-only).
1825 highres= [KNL] Enable/disable high resolution timer mode.
1844 hpet= [X86-32,HPET] option to control HPET usage
1861 number of pages to allocate per-node can be specified.
1862 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1873 Documentation/admin-guide/mm/hugetlbpage.rst.
1884 boot-time allocation of gigantic hugepages is skipped.
1912 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1918 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1938 Set device-properties for ACPI-enumerated I2C-attached
1939 touchscreen, to e.g. fix coordinates of upside-down
1947 Omit "=<val>" entirely Set a boolean device-property
1948 Unsigned number Set a u32 device-property
1949 Anything else Set a string device-property
1952 i2c_touchscreen_props=GDIX1001:touchscreen-inverted-x:
1953 touchscreen-inverted-y
1955 i2c_touchscreen_props=MSSL1680:touchscreen-size-x=1920:
1956 touchscreen-size-y=1080:touchscreen-inverted-y:
1957 firmware-name=gsl1680-vendor-model.fw:silead,home-button
1962 (disabled by default, and as a pre-condition
1964 i8042.direct [HW] Put keyboard port into non-translated mode
1978 suspend-to-ram transitions, only during s2r
2002 -1 -- never invert brightness
2003 0 -- machine default
2004 1 -- force brightness inversion
2006 ia32_emulation= [X86-64]
2008 When true, allows loading 32-bit programs and executing 32-bit
2024 idle=nomwait: Disable mwait for CPU C-states
2052 legacy only accept legacy-NaN binaries, if supported
2054 2008 only accept 2008-NaN binaries, if supported
2065 'relaxed' straps the emulator for both legacy-NaN and
2066 2008-NaN, whereas 'strict' enables legacy-NaN only on
2075 Ignore loglevel setting - this will print /all/
2142 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2143 "ima-sigv2" }
2144 Default: "ima-ng"
2177 stuff: Deploy RSB-fill mitigation when retpoline is
2182 Documentation/admin-guide/hw-vuln/indirect-target-selection.rst
2193 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2194 initcall functions. Useful for debugging built-in
2239 0 -- basic integrity auditing messages. (Default)
2240 1 -- additional integrity auditing messages.
2268 could harm performance of some high-throughput
2277 1 to 9 specify maximum depth of C-state.
2286 algorithms for p-state selection. There are two
2287 P-state selection algorithms provided by
2290 on whether or not the hardware managed P-states
2297 used along with the hardware-managed P-states (HWP)
2301 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2302 instead of acpi-cpufreq may disable platform features, such
2304 P-States information being indicated to OSPM and therefore
2307 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2320 Allow per-logical-CPU P-State performance control limits using
2323 intremap= [X86-64,Intel-IOMMU,EARLY]
2328 BIOS x2APIC opt-out request will be ignored
2354 0 - Try to allocate a 32-bit DMA address first, before
2356 1 - Allocate directly from the full usable range,
2358 greater than 32-bit addressing.
2362 0 - Lazy mode.
2368 1 - Strict mode.
2371 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2373 legacy driver-specific options takes precedence.
2378 0 - Use IOMMU translation for DMA.
2379 1 - Bypass the IOMMU for DMA.
2380 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2382 io7= [HW] IO7 for Marvel-based Alpha systems
2397 See Documentation/admin-guide/nfs/nfsroot.rst.
2433 Enables support for pseudo-NMIs in the kernel. This
2444 for it. Also check all handlers each timer
2452 [Deprecated - use cpusets instead]
2453 Format: [flag-list,]<cpu-list>
2484 "number of CPUs in system - 1".
2510 The format of <cpu-list> is described above.
2514 ivrs_ioapic [HW,X86-64]
2515 Provide an override to the IOAPIC-ID<->DEVICE-ID
2519 For example, to map IOAPIC-ID decimal 10 to
2525 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2528 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2532 ivrs_hpet [HW,X86-64]
2533 Provide an override to the HPET-ID<->DEVICE-ID
2537 For example, to map HPET-ID decimal 10 to
2543 * To map HPET-ID decimal 0 to PCI device 00:14.0
2546 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2550 ivrs_acpihid [HW,X86-64]
2551 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2555 For example, to map UART-HID:UID AMD0020:0 to
2561 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2564 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2588 the kernel for non-movable allocations. The requested
2598 subsystem. Note that allocations like PTEs-from-HighMem
2606 for non-movable allocations and remaining memory is used
2617 gdb or control-c on the dbgp connection. When
2618 not using this parameter you use sysrq-g to break into
2623 or a supported polling keyboard driver (non-usb).
2650 Configure the RouterBoard 532 series on-chip
2653 kmemleak= [KNL,EARLY] Boot-time kmemleak enable/disable
2659 kprobe_event=[probe-list]
2661 The probe-list is a semicolon delimited list of probe
2691 execution by eliminating the write-protection faults
2718 virtualization on-demand when creating and destroying
2726 is that doing so may interfere with using out-of-tree
2753 back to huge pages. If the value is a non-zero N, KVM will
2758 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2761 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2762 a.k.a. Two-Dimensional Page Tables. Default is 1
2766 kvm-arm.hyp_lm_size_mb=
2769 memory than this into pKVM stage-1 at run-time may be fatal.
2771 kvm-arm.mode=
2777 nvhe: Standard nVHE-based mode, without support for
2780 protected: nVHE-based mode with support for guests whose
2785 nested: VHE-based mode with support for nested
2794 kvm-arm.protected_modules=
2799 kvm-arm.mode=protected.
2801 kvm-arm.protected_prefault=
2805 kvm-arm.vgic_v3_group0_trap=
2806 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0
2809 kvm-arm.vgic_v3_group1_trap=
2810 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-1
2813 kvm-arm.vgic_v3_common_trap=
2817 kvm-arm.vgic_v4_enable=
2821 kvm-arm.wfe_trap_policy=
2830 kvm-arm.wfi_trap_policy=
2847 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
2848 a.k.a. Two-Dimensional Page Tables. Default is 1
2852 kvm-intel.emulate_invalid_guest_state=
2854 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
2860 kvm-intel.flexpriority=
2865 kvm-intel.nested=
2869 kvm-intel.unrestricted_guest=
2875 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2876 CVE-2018-3620.
2887 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
2907 on - enable the interface for the mitigation
2972 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2978 lapic [X86-32,APIC,EARLY] Enable the local APIC even if BIOS
2982 value for LAPIC timer one-shot implementation. Default
2983 back to the programmable timer unit in the LAPIC.
2986 lapic_timer_c2_ok [X86,APIC,EARLY] trust the local apic timer
3005 libata.force= [LIBATA] Force configurations. The format is a comma-
3017 first fan-out link behind PMP device. It does not
3031 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
3038 * rstonce: only attempt one reset during hot-unplug
3081 * external: Mark port as external (hotplug-capable).
3135 Specify the number of self-propagating call_rcu()
3143 occasional long-duration lock hold time. Defaults
3154 Set the number of locking read-acquisition kthreads.
3159 Set the number of locking write-acquisition kthreads.
3162 Set time (s) after boot for CPU-hotplug testing.
3165 Set time (s) between CPU-hotplug operations, or
3166 zero to disable CPU-hotplug testing.
3169 Do periodic testing of real-time lock priority
3174 non-real-time spinlocks, due to their disabling
3175 of preemption. Note that non-realtime mutexes
3188 Set task-shuffle interval (jiffies). Shuffling
3189 tasks allows some CPUs to go into dyntick-idle
3194 is useful for hands-off automated testing.
3213 Run the write-side locktorture kthreads at
3214 sched_set_fifo() real-time priority.
3232 7 (KERN_DEBUG) debug-level messages
3244 logo.nologo [FB] Disables display of the built-in Linux logo.
3262 an IEEE 1284-compliant printer is attached; if
3268 time-consuming boot-time autodetection (up to 250 ms per
3288 Example: machtype=lemote-yeeloong-2f-7inch
3300 (loop.max_loop) unconditionally pre-created at init time. The default
3303 devices can be requested on-demand with the
3304 /dev/loop-control interface.
3306 mce [X86-32] Machine Check Exception
3308 mce=option [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
3311 See Documentation/admin-guide/md.rst.
3318 Control mitigation for the Micro-architectural Data
3333 full - Enable MDS mitigation on vulnerable CPUs
3334 full,nosmt - Enable MDS mitigation and disable
3336 off - Unconditionally disable MDS mitigation
3338 On TAA-affected machines, mds=off can be prevented by
3347 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3362 [ARC,MICROBLAZE] - the limit applies only to low memory,
3365 [ARM64] - only limits memory covered by the linear
3378 [ARM,MIPS,EARLY] - override the memory layout
3385 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3392 per-device physically contiguous DMA buffers.
3400 See Documentation/admin-guide/mm/memory-hotplug.rst.
3425 Example: Exclude memory from 0x18690000-0x1869ffff
3439 memmap=<size>%<offset>-<oldtype>+<newtype>
3441 from <oldtype> to <newtype>. If "-<oldtype>" is left
3456 repeatable BIOS-originated corruption always
3500 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3506 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3510 s2idle - Suspend-To-Idle
3511 shallow - Power-On Suspend or equivalent (if supported)
3512 deep - Suspend-To-RAM or equivalent (if supported)
3513 See Documentation/admin-guide/pm/sleep-states.rst.
3515 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3531 0 - The attached screen is the 3.5" TFT
3532 1 - The attached screen is the 7" TFT
3533 2 - The VGA Shield is attached (1024x768)
3537 b - Enable backlight. The TFT backlight pin will be
3541 c - Enable the s3c camera interface.
3542 t - Reserved for enabling touchscreen support. The
3546 https://repo.or.cz/w/linux-2.6/mini2440.git
3551 arch-independent options, each of which is an
3552 aggregation of existing arch-specific options.
3582 ssbd=force-off [ARM64]
3596 have other ways of avoiding SMT-based attacks.
3631 full - Enable mitigation on vulnerable CPUs
3633 full,nosmt - Enable mitigation and disable SMT on
3636 off - Unconditionally disable mitigation
3649 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3679 module_blacklist= [KNL] Do not load a comma-separated list of
3704 movable_node [KNL,EARLY] Boot-time switch to make hotplugable memory
3711 Format: <name>,<region-number>,<size>,<offset>
3714 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3753 something different and driver-specific.
3793 [NFS] enable 64-bit inode numbers.
3794 If zero, the NFS client will fake up a 32-bit inode
3796 of returning the full 64-bit number.
3797 The default is to return 64-bit inode numbers.
3832 [NFS4] Specify an additional fixed unique ident-
3863 driver. A non-zero value sets the minimum interval
3868 server-to-server copies for which this server is
3880 server-to-server copy, knfsd temporarily mounts
3887 See Documentation/admin-guide/nfs/nfsroot.rst.
3889 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3890 See Documentation/admin-guide/nfs/nfsroot.rst.
3893 See Documentation/admin-guide/nfs/nfsroot.rst.
3897 NMI stack-backtrace request.
3906 0 - turn hardlockup detector in nmi_watchdog off
3907 1 - turn hardlockup detector in nmi_watchdog on
3908 rNNN - configure the watchdog with raw perf event 0xNNN
3921 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3925 no4lvl [RISCV,EARLY] Disable 4-level and 5-level paging modes.
3926 Forces kernel to use 3-level paging instead.
3928 no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces
3929 kernel to use 4-level paging instead.
3962 no_entry_flush [PPC,EARLY] Don't flush the L1-D cache when entering the kernel.
3964 noexec32 [X86-64]
3965 This affects only 32-bit executables.
3966 noexec32=on: enable non-executable mappings (default)
3968 noexec32=off: disable non-executable mappings
3979 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3981 legacy floating-point registers on task switch.
3992 compared. However, if this command-line option is
4033 nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
4035 [Deprecated - use intremap=off]
4041 noirqdebug [X86-32] Disables the code which attempts to detect and
4051 no-kvmapf [X86,KVM,EARLY] Disable paravirtualized asynchronous page
4054 no-kvmclock [X86,KVM,EARLY] Disable paravirtualized KVM clock driver
4056 nolapic [X86-32,APIC,EARLY] Do not enable or use the local APIC.
4058 nolapic_timer [X86-32,APIC,EARLY] Do not use the local APIC timer.
4060 nomce [X86-32] Disable Machine Check Exception
4062 nomfgpt [X86-32] Disable Multi-Function General Purpose
4063 Timer usage (for AMD Geode machines).
4068 not load if they could possibly displace the pre-
4071 perform display-mode changes or accelerated rendering.
4084 nopcid [X86-64,EARLY] Disable the PCID cpu feature.
4089 nopti [X86-64,EARLY]
4105 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
4111 no-scroll [VGA] Disables scrollback.
4112 This is required for the Braillex ib80-piezo Braille
4115 nosgx [X86-64,SGX,EARLY] Disables Intel SGX kernel support.
4135 nosoftlockup [KNL] Disable the soft-lockup detector.
4141 nospectre_bhb [ARM64,EARLY] Disable all mitigations for Spectre-BHB (branch
4154 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV,LOONGARCH,EARLY]
4161 broken timer IRQ sources.
4164 [PPC,EARLY] Don't flush the L1-D cache after accessing user data.
4177 no-vmw-sched-clock
4182 soft-lockup and NMI watchdog (hard-lockup).
4186 nox2apic [X86-64,APIC,EARLY] Do not enable x2APIC mode.
4194 enabling legacy floating-point and sse state.
4216 n. So during boot up some boot time memory for per-cpu
4217 variables need be pre-allocated for later physical cpu
4248 See Documentation/admin-guide/sysctl/vm.rst for details.
4251 See Documentation/core-api/debugging-via-ohci1394.rst for more
4266 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4270 boundary - index of last SLC block on Flex-OneNAND.
4272 lock - Configure if Flex-OneNAND boundary should be locked.
4291 page_owner= [KNL,EARLY] Boot-time page_owner enabling option.
4297 page_poison= [KNL,EARLY] Boot-time parameter changing the state of
4325 See Documentation/admin-guide/tainted-kernels.rst for
4336 bit 2: print timer info
4378 Set to non-zero to probe primary and secondary ISA
4384 Set to non-zero if a chip is present that snoops speed
4432 Set to non-zero to probe tertiary and further ISA
4448 Set to non-zero to probe QDI controllers. By default
4453 Set to non-zero to probe Winbond controllers. Use
4500 bios [X86-32] force use of PCI BIOS, don't access
4502 has a non-standard PCI host bridge.
4503 nobios [X86-32] disallow use of PCI BIOS, only direct
4509 data in IO port 0xCFC, both 32-bit).
4511 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4512 the function, IO port 0xCFA, also 8-bit, sets
4514 through ports 0xC000-0xCFFF).
4521 root domains (aka PCI segments, in ACPI-speak).
4529 disable the use of MSI interrupts system-wide.
4534 primary IO-APIC for bridges that cannot disable
4541 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4565 F0000h-100000h range.
4570 assign-busses [X86] Always assign all PCI bus
4591 <linux-pci@vger.kernel.org>.
4595 a bug to <linux-pci@vger.kernel.org>.
4607 bfsort Sort PCI devices into breadth-first order.
4610 nobfsort Don't sort PCI devices into breadth-first order.
4612 tuning and use the BIOS-configured MPS defaults.
4622 configuration allows peer-to-peer DMA between
4625 that hot-added devices will work.
4640 A PCI-PCI bridge can be specified if resource
4646 for 4096-byte alignment.
4648 end-to-end CRC checking). Only effective if
4679 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4710 bit-0 : ACS Source Validation
4711 bit-1 : ACS Translation Blocking
4712 bit-2 : ACS P2P Request Redirect
4713 bit-3 : ACS P2P Completion Redirect
4714 bit-4 : ACS Upstream Forwarding
4715 bit-5 : ACS P2P Egress Control
4716 bit-6 : ACS Direct Translated P2P
4726 Validation unchanged from whatever power-up
4748 dpc-native Use native PCIe service for DPC only. May
4770 Keep all power-domains already enabled by bootloader on,
4788 pirq= [SMP,APIC] Manual mp-table setup
4789 See Documentation/arch/x86/i386/IO-APIC.rst.
4793 See also Documentation/admin-guide/parport.rst.
4812 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4821 { on | off | curr | res | no-curr | no-res }
4866 none - Limited to cond_resched() calls
4867 voluntary - Limited to cond_resched() and might_sleep() calls
4868 full - Any section that isn't explicitly preempt disabled
4873 print-fatal-signals=
4879 coredump - etc.
4882 you might want to try "ulimit -i unlimited".
4894 or lockdep-detected issues (only if lock debug is on).
4902 Allows storing messages from non-panic CPUs into
4904 flushed to consoles by the panic-CPU on
4905 a best-effort basis.
4911 on - unlimited logging to /dev/kmsg from userspace
4912 off - logging to /dev/kmsg disabled
4913 ratelimit - ratelimit the logging
4924 - 'always': traditional behavior always allows mem overrides.
4925 - 'ptrace': only allow mem overrides for active ptracers.
4926 - 'never': never allow mem overrides.
4930 Limit processor to maximum C-state
4934 Ignore the _CST method to determine C-states,
4941 Param: "schedule" - profile schedule points.
4942 Param: "kvm" - profile VM exits.
4943 Param: <number> - step/bucket size as a power of 2 for
4974 pti= [X86-64] Control Page Table Isolation of user and
4979 on - unconditionally enable
4980 off - unconditionally disable
4981 auto - kernel detects whether your CPU model is
4987 [KNL] Number of legacy pty's. Overwrites compiled-in
4999 See Documentation/admin-guide/md.rst.
5002 See Documentation/admin-guide/blockdev/ramdisk.rst.
5021 cross-syscall address exposures. This is only
5027 ras=option[,option,...] [KNL] RAS-specific options
5033 rcu_nocbs[=cpu-list]
5038 enable the no-callback CPU mode, which prevents
5043 "p" for RCU-preempt, "s" for RCU-sched, and "g"
5047 and real-time workloads. It can also improve
5051 list of CPUs is set to no-callback mode from boot.
5055 no-callback mode from boot but the mode may be
5066 This improves the real-time response for the
5077 Do only a one-line RCU CPU stall warning when
5078 there is an ongoing too-long CSD-lock wait.
5084 If triggered before the RCU grace-period machinery
5094 RCU grace-period cleanup.
5098 RCU grace-period initialization.
5102 RCU grace-period pre-initialization, that is,
5103 the propagation of recent CPU-hotplug changes up
5107 Set delay from grace-period initialization to
5120 soliciting quiescent-state help from
5132 Set the SCHED_FIFO priority of the RCU per-CPU
5135 and for the RCU grace-period kthreads (rcu_bh,
5137 set, valid values are 1-99 and the default is 1
5138 (the least-favored priority). Otherwise, when
5139 RCU_BOOST is not set, valid values are 0-99 and
5140 the default is zero (non-realtime operation).
5145 On callback-offloaded (rcu_nocbs) CPUs,
5148 use of the ->nocb_bypass list. However, in the
5149 common non-flooded case, RCU queues directly to
5150 the main ->cblist in order to avoid the extra
5151 overhead of the ->nocb_bypass list and its lock.
5153 a single jiffy, RCU pre-queues the callbacks into
5154 the ->nocb_bypass queue. The definition of "too
5158 On callback-offloaded (rcu_nocbs) CPUs, avoid
5171 batch limiting is re-enabled.
5175 RCU's force-quiescent-state scan will aggressively
5183 Set the page-cache refill delay (in milliseconds)
5184 in response to low-memory conditions. The range
5188 Set the shift-right count to use to compute
5189 the callback-invocation batch limit bl from
5196 Please note that this callback-invocation batch
5197 limit applies only to non-offloaded callback
5206 cache-to-cache transfer latencies.
5212 and for NUMA systems with large remote-access
5228 the wakeup overhead on the global grace-period
5230 each group's NOCB grace-period kthread.
5233 Cause the grace-period kthread to get an extra
5235 it should at force-quiescent-state time.
5248 this specifies an rcu_read_unlock()-time delay
5252 of RCU-protected pointers after the relevant
5262 per-CPU rcuc kthreads. Defaults to a non-zero
5291 grace-period primitives such as call_rcu().
5302 grace-period primitives.
5305 Set test-start holdoff period. The purpose of
5323 Test the double-argument variant of kfree_rcu().
5325 rcuscale.kfree_rcu_test_single, both the single-
5326 and double-argument variants are tested.
5329 Test the single-argument variant of kfree_rcu().
5331 rcuscale.kfree_rcu_test_double, both the single-
5332 and double-argument variants are tested.
5346 does not affect the data-collection interval,
5351 Set number of RCU readers. The value -1 selects
5353 "n" less than -1 selects N-n+1, where N is again
5354 the number of CPUs. For example, -2 selects N
5355 (the number of CPUs), -3 selects N+1, and so on.
5356 A value of "n" less than or equal to -N selects
5369 complete. This is useful for hands-off automated
5376 Write-side holdoff between grace periods,
5381 Additional write-side holdoff between grace
5399 for RCU grace-period forward-progress testing
5406 Specify the fraction of a CPU-stall-warning
5407 period to do tight-loop forward-progress testing.
5411 forward-progress tests.
5415 need_resched() during tight-loop forward-progress
5419 Use conditional/asynchronous update-side
5423 Use expedited update-side primitives, if available.
5426 Use normal (non-expedited) asynchronous
5427 update-side primitives, if available.
5430 Use normal (non-expedited) synchronous
5431 update-side primitives, if available. If all
5435 they are all non-zero.
5439 accurately, from a timer handler. Not all RCU
5443 Leak an RCU-protected pointer out of the reader.
5458 Set number of RCU callback-offload togglers.
5463 callback-offload toggling attempts.
5466 Set number of RCU readers. The value -1 selects
5467 N-1, where N is the number of CPUs. A value
5468 "n" less than -1 selects N-n-2, where N is again
5469 the number of CPUs. For example, -2 selects N
5470 (the number of CPUs), -3 selects N+1, and so on.
5473 Enable debug-object double-call_rcu() testing.
5476 Set time (s) after boot for CPU-hotplug testing.
5479 Set time (jiffies) between CPU-hotplug operations,
5480 or zero to disable CPU-hotplug testing.
5483 Set the number of read-then-exit kthreads used
5485 task-exit processing.
5488 The number of times in a given read-then-exit
5489 episode that a set of read-then-exit kthreads
5494 read-then-exit testing episodes.
5497 Set task-shuffle interval (s). Shuffling tasks
5498 allows some CPUs to go into dyntick-idle mode
5503 is useful for hands-off automated testing.
5512 any other stall-related activity. Note that
5518 in scheduling-while-atomic splats.
5537 grace-period kthread to test RCU CPU stall
5563 Test RCU's dyntick-idle handling. See also the
5616 adjusted to an arch timer tick resolution.
5633 Use expedited grace-period primitives, for
5637 real-time latency, and degrade energy efficiency.
5641 Use only normal grace-period primitives,
5644 real-time latency, CPU utilization, and
5646 increased grace-period latency. This parameter
5653 only normal grace-period primitives. No effect
5659 post-boot attempt at an expedited RCU grace
5660 period to instead use normal non-expedited
5661 grace-period processing.
5669 set to the default value of -1.
5672 Set the minimum number of callback-queuing-time
5673 lock-contention events per jiffy required to
5674 cause the RCU Tasks flavors to switch to per-CPU
5677 the default value of -1.
5682 of -1 allows this to be automatically (and
5690 number avoids disturbing real-time workloads,
5695 cancel laziness on that CPU. Use -1 to disable
5705 only printed prior to the stall-warning message
5753 force - Override the decision by the kernel to hide the
5781 Set test-start holdoff period. The purpose of
5796 but the default has already reduced the per-pass
5801 Set number of readers. The default value of -1
5810 Set the read-side critical-section duration,
5814 Specify the read-protection implementation to test.
5840 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
5870 reservetop= [X86-32,EARLY]
5887 See Documentation/power/swsusp-and-swap-files.rst
5903 AMD-based UNRET and IBPB mitigations alone do not stop
5905 sibling threads. For that reason, STIBP is used on pro-
5909 off - no mitigation
5910 auto - automatically select a migitation
5911 auto,nosmt - automatically select a mitigation,
5915 ibpb - On AMD, mitigate short speculation
5920 ibpb,nosmt - Like "ibpb" above but will disable SMT
5924 unret - Force enable untrained return thunks,
5925 only effective on AMD f15h-f17h based
5927 unret,nosmt - Like unret, but will disable SMT when STIBP
5959 ro [KNL] Mount root device read-only on boot
5962 on Mark read-only kernel memory as read-only (default).
5963 off Leave read-only kernel memory writable for debugging.
5964 full Mark read-only kernel memory and aliases as read-only
5971 debug-uart get routed to the D+ and D- pins of the usb
5977 block/early-lookup.c for details.
6002 rw [KNL] Mount root device read-write on boot
6031 solution to mutex-based priority inversion.
6061 to 10 seconds for built-in smp_call_function()
6068 that requesting even small non-zero numbers of
6075 The default of -1 specifies a number of kthreads
6080 test before initiating CPU-hotplug operations.
6084 CPU-hotplug operations. Specifying zero (which
6085 is the default) disables CPU-hotplug operations.
6091 Non-zero values are useful for automated tests.
6114 "wait" parameter. A value of -1 selects the
6115 default if all other weights are -1. However,
6117 value of -1 will instead select a weight of zero.
6122 non-zero "wait" parameter. See weight_single.
6135 non-zero "wait" parameter. See weight_single
6147 non-zero "wait" parameter. See weight_single
6150 skew_tick= [KNL,EARLY] Offset the periodic timer tick per cpu to mitigate
6154 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
6155 1 -- enable.
6166 0 -- disable.
6167 1 -- enable.
6170 serialnumber [BUGS=X86-32]
6172 sev=option[,option...] [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
6180 to set it to "all" by meaning -- no limit here.
6251 using the csdlock_debug- kernel parameter.
6256 system. By default, let CSD-lock acquisition
6258 for this value provides a 5-minute timeout.
6260 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
6261 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
6262 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
6263 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
6264 smsc-ircc2.ircc_irq= [HW] IRQ line
6265 smsc-ircc2.ircc_dma= [HW] DMA channel
6266 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
6276 Default: -1 (no limit)
6279 [KNL] Should the soft-lockup detector generate panics.
6282 A value of 1 instructs the soft-lockup detector
6283 to panic the machine when a soft-lockup occurs. It is
6286 respective build-time switch to that functionality.
6289 [KNL] Should the soft-lockup detector generate
6294 See Documentation/admin-guide/laptops/sonypi.rst
6301 on - (default) Enable the HW or SW mitigation as
6304 vmexit - On systems which don't have the HW mitigation
6307 protected from VM-originated BHI attacks, but
6309 off - Disable the mitigation.
6316 on - unconditionally enable, implies
6318 off - unconditionally disable, implies
6320 auto - kernel detects whether your CPU model is
6339 retpoline - replace indirect branches
6340 retpoline,generic - Retpolines
6341 retpoline,lfence - LFENCE; indirect branch
6342 retpoline,amd - alias for retpoline,lfence
6343 eibrs - Enhanced/Auto IBRS
6344 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
6345 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
6346 ibrs - use IBRS to protect kernel
6356 on - Unconditionally enable mitigations. Is
6359 off - Unconditionally disable mitigations. Is
6362 prctl - Indirect branch speculation is enabled,
6368 - Like "prctl" above, but only STIBP is
6374 - Same as "prctl" above, but all seccomp
6379 - Like "seccomp" above, but only STIBP is
6384 auto - Kernel selects the mitigation depending on
6395 off - Disable mitigation
6396 microcode - Enable microcode mitigation only
6397 safe-ret - Enable sw-only safe RET mitigation (default)
6398 ibpb - Enable mitigation by issuing IBPB on
6400 ibpb-vmexit - Issue IBPB only on VMEXIT
6401 (cloud-specific mitigation)
6426 on - Unconditionally disable Speculative Store Bypass
6427 off - Unconditionally enable Speculative Store Bypass
6428 auto - Kernel detects whether the CPU model contains an
6434 prctl - Control Speculative Store Bypass per thread
6438 seccomp - Same as "prctl" above, but all seccomp threads
6446 on,auto - On Power8 and Power9 insert a store-forwarding
6450 off - No action.
6464 off - not enabled
6466 warn - the kernel will emit rate-limited warnings
6474 fatal - the kernel will send SIGBUS to applications
6479 ratelimit:N -
6499 Certain CPUs are vulnerable to an MDS-like
6519 This kernel-boot parameter defaults to 128,
6520 but takes effect only when the low-order four
6537 instead of the compile-time CONFIG_NR_CPUS.
6541 grace-period sequence counter wrap for the
6542 srcu_data structure's ->srcu_gp_seq_needed field.
6557 Specifies the number of no-delay instances
6564 Specifies the per-grace-period phase, number of
6565 non-sleeping polls of readers. Beyond this limit,
6571 Specifies number of microseconds of non-sleeping
6572 delay between each non-sleeping poll of readers.
6575 Specifies the number of update-side contention
6580 set for contention-based conversions to occur.
6590 force-on: Unconditionally enable mitigation for
6592 force-off: Unconditionally disable mitigation for
6615 stacktrace_filter=[function-list]
6617 will trace at boot up. function-list is a comma-separated
6625 Set the STI (builtin display/keyboard on the HP-PARISC
6627 as the initial boot-console.
6687 to global on non-NUMA machines)
6712 <int> -- Number of I/O TLB slabs
6713 <int> -- Second integer after comma. Number of swiotlb
6716 force -- force using of bounce buffers even if they
6718 noforce -- Never use bounce buffers (for debugging)
6733 Ignore sysrq setting - this boot parameter will
6741 cache size. See Documentation/networking/ip-sysctl.rst
6748 Specify "mem" (for Suspend-to-RAM) or "standby" (for
6753 wakeup-capable RTC alarm.
6759 -1: disable all active trip points in all thermal zones
6763 -1: disable all critical trip points in all thermal zones
6770 -1: disable all passive trip points
6776 <deci-seconds>: poll all this frequency
6780 Format: <size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>
6785 See Documentation/admin-guide/mm/transhuge.rst for more
6801 Prevent the CPU-hotplug component of torturing
6805 Dump the ftrace buffer at torture-test shutdown,
6809 with rotating-rust storage.
6814 disables verbose-printk() sleeping.
6817 Duration of each verbose-printk() sleep in jiffies.
6842 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
6880 local - Use the per CPU time stamp counter
6884 global - Event time stamps are synchronize across
6887 counter - Simple counting of events (1, 2, ..)
6891 uptime - Use jiffies as the time stamp.
6892 perf - Use the same clock that perf uses.
6893 mono - Use ktime_get_mono_fast_ns() for time stamps.
6894 mono_raw - Use ktime_get_raw_fast_ns() for time
6896 boot - Use ktime_get_boot_fast_ns() for time stamps.
6900 trace_event=[event-list]
6902 to facilitate early boot debugging. The event-list is a
6903 comma-separated list of trace events to enable. See
6906 trace_instance=[instance-info]
6931 traceoff - Have the tracing instance tracing disabled after it is created.
6932 traceprintk - Have trace_printk() write into this trace instance
6971 trace_options=[option-list]
6973 The option-list is a comma delimited list of options
6987 trace_trigger=[trigger-list]
7024 See Documentation/admin-guide/mm/transhuge.rst
7032 - "tpm"
7033 - "tee"
7034 - "caam"
7035 - "dcp"
7045 - "kernel"
7046 - the same value as trusted.source: "tpm" or "tee"
7047 - "default"
7070 off - disable the mitigation
7071 on - enable the mitigation (default)
7072 user - mitigate only user/kernel transitions
7073 vm - mitigate only guest/host transitions
7081 high-resolution timer mode on older hardware, and in
7094 [x86] recalibrate: force recalibration against a HW timer
7095 (HPET or PM timer) on systems whose TSC frequency was
7099 which to check other HW timers (HPET or PM timer), but
7117 on - Enable TSX on the system. Although there are
7120 several previous speculation-related CVEs, and
7124 off - Disable TSX on the system. (Note that this
7132 auto - Disable TSX if X86_BUG_TAA is present,
7137 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7143 Similar to Micro-architectural Data Sampling (MDS)
7158 full - Enable TAA mitigation on vulnerable CPUs
7161 full,nosmt - Enable TAA mitigation and disable SMT on
7164 vulnerable to cross-thread TAA attacks.
7165 off - Unconditionally disable TAA mitigation
7167 On MDS-affected machines, tsx_async_abort=off can be
7179 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7185 See also Documentation/input/devices/joystick-parport.rst
7187 udbg-immortal [PPC] When debugging early kernel crashes that
7193 Set number of hash buckets for UDP/UDP-Lite connections
7195 uhci-hcd.ignore_oc=
7197 Some badly-designed motherboards generate lots of
7206 unwind_debug [X86-64,EARLY]
7214 (default -1 = authorized (same as 1),
7220 for newly-detected USB devices (default 2). This
7248 [USB] Specifies timeout for the initial 64-byte
7255 [USB] A list of quirk entries to augment the built-in
7258 VendorID:ProductID:Flags. The IDs are 4-digit hex
7260 will change the built-in quirk; setting it if it is
7265 a 255-byte read);
7269 Set-Interface requests);
7288 (bInterval-1).
7326 usb-storage.delay_use=
7333 usb-storage.quirks=
7335 override the built-in unusual_devs list. List
7338 and Product ID values (4-digit hex numbers) and
7340 to a common usb-storage quirk flag as follows:
7382 medium is write-protected).
7391 1 - undefined instruction events
7392 2 - system calls
7393 4 - invalid data aborts
7394 8 - SIGSEGV faults
7395 16 - SIGBUS faults
7411 vdso32= [X86] Control the 32-bit vDSO
7412 vdso32=1: enable 32-bit VDSO
7413 vdso32=0 or vdso32=2: disable 32-bit VDSO
7423 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
7454 vga= [BOOT,X86-32] Select a particular video mode
7456 Documentation/admin-guide/svga.rst.
7471 - Disable all of the above options
7497 hypervisor to a guest via speculative side-channels.
7499 off - disable the mitigation
7500 ibpb - use Indirect Branch Prediction Barrier
7502 force - force vulnerability detection even on
7505 vsyscall= [X86-64,EARLY]
7508 code). Most statically-linked binaries and older
7532 see VGA-softcursor.txt. Default: 2 = underline.
7537 This is a 16-member array composed of values
7538 ranging from 0-255.
7543 This is a 16-member array composed of values
7544 ranging from 0-255.
7549 This is a 16-member array composed of values
7550 ranging from 0-255.
7555 Set system-wide default UTF-8 mode for all tty's.
7556 Default is 1, i.e. UTF-8 mode is enabled for all
7561 Format=<-1|0|1>
7562 Set system-wide default for whether a cursor
7563 is shown on new VTs. Default is -1,
7568 vt.italic= [VT] Default color for italic text; 0-15.
7571 vt.underline= [VT] Default color for underlined text; 0-15.
7575 see Documentation/watchdog/watchdog-parameters.rst
7576 or other driver-specific files in the
7590 Format: <cpu-list>
7611 Per-cpu work items which run for longer than this
7614 them from noticeably delaying other per-cpu work
7632 Per-cpu workqueues are generally preferred because
7634 locality; unfortunately, per-cpu workqueues tend to
7637 Enabling this makes the per-cpu workqueues which
7651 Documentation/core-api/workqueue.rst.
7664 forces round-robin CPU selection to flush out
7672 on - Enable writecombine, use WUC for ioremap_wc()
7673 off - Disable writecombine, use SUC for ioremap_wc()
7675 x2apic_phys [X86-64,APIC,EARLY] Use x2apic physical mode instead of
7679 xen_512gb_limit [KNL,X86-64,XEN]
7689 ide-disks -- unplug primary master IDE devices
7690 aux-ide-disks -- unplug non-primary-master IDE devices
7691 nics -- unplug network devices
7692 all -- unplug all emulated devices (NICs and IDE disks)
7693 unnecessary -- unplugging emulated devices is
7696 never -- do not unplug even if version check succeeds
7710 Select whether to always use non-faulting (safe) MSR
7730 xen_timer_slop= [X86-64,XEN,EARLY]
7731 Set the timer slop (in nanoseconds) for the virtual Xen
7734 improve timer resolution at the expense of processing
7735 more timer interrupts.
7755 preferred over the 2-level event handling, as it is
7772 xive.store-eoi=off [PPC]
7778 xhci-hcd.quirks [USB,KNL]