Lines Matching +full:region +full:- +full:freeze +full:- +full:timeout +full:- +full:us
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 nocmcff -- Disable firmware first mode for corrected
28 nospcr -- disable console in ACPI SPCR table as
45 If set to vendor, prefer vendor-specific driver
77 Documentation/firmware-guide/acpi/debug.rst for more information about
135 Format: <byte> or <bitmap-list>
138 Disable auto-serialization of AML methods
141 auto-serialization feature.
159 Ignore the ACPI-based watchdog interface (WDAT) and let
180 acpi_osi=! # disable all built-in OS vendor
182 acpi_osi=!! # enable all built-in OS vendor
244 For broken nForce2 BIOS resulting in XT-PIC timer.
253 as soon as the kernel's real-mode entry point is called.
291 See Documentation/sound/alsa-configuration.rst
298 align_va_addr= [X86-64]
303 CPU-intensive style benchmark, and it can vary highly in
306 32: only for 32-bit processes
307 64: only for 64-bit processes
308 on: enable for both 32- and 64-bit processes
309 off: disable for both 32- and 64-bit processes
319 Allow execve() of 32-bit applications and setting of the
321 subset of the CPUs support 32-bit EL0. When this
322 parameter is present, the set of CPUs supporting 32-bit
324 and hot-unplug operations may be restricted.
326 See Documentation/arch/arm64/asymmetric-32bit.rst for more
329 amd_iommu= [HW,X86-64]
332 fullflush - Deprecated, equivalent to iommu.strict=1
333 off - do not initialize any AMD IOMMU found in
335 force_isolation - Force device isolation for all
340 force_enable - Force enable the IOMMU on platforms known
343 pgtbl_v1 - Use v1 page table for DMA-API (Default).
344 pgtbl_v2 - Use v2 page table for DMA-API.
345 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
346 nohugepages - Limit page-sizes used for v1 page-tables
348 v2_pgsizes_only - Limit page-sizes used for v1 page-tables
352 amd_iommu_dump= [HW,X86-64]
358 amd_iommu_intr= [HW,X86-64]
361 legacy - Use legacy interrupt remapping mode.
362 vapic - Use virtual APIC mode, which allows IOMMU
364 This mode requires kvm-amd.avic=1.
393 Disable amd-pstate preferred core.
406 Power management functions (SPARCstation-4/5 + deriv.)
408 Disable APC CPU standby support. SPARCstation-Fox does
409 not play well with APC CPU idle - disable it if you have
412 apic [APIC,X86-64] Use IO-APIC. Default.
418 when initialising the APIC and IO-APIC components.
442 0 -- disable.
443 1 -- enable.
446 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
497 audit= [KNL] Enable the audit sub-system
499 0 | off - kernel audit is disabled and can not be
501 unset - kernel audit is initialized but disabled and
503 1 | on - kernel audit is initialized and partially
516 0 - Disable the BAU.
517 1 - Enable the BAU.
518 unset - Disable the BAU.
557 See Documentation/block/cmdline-partition.rst
571 See Documentation/admin-guide/bootconfig.rst
576 bttv.pll= See Documentation/admin-guide/media/bttv.rst
585 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
604 inclusive. See arch/mips/include/asm/pgtable-bits.h
614 - foo isn't auto-mounted if you mount all cgroups in
616 - foo isn't visible as an individually mountable
618 - if foo is an optional feature then the feature is
624 Specifying "pressure" disables per-cgroup pressure
641 semi-legacy software can check this file to decide
650 nosocket -- Disable socket memory accounting.
651 nokmem -- Disable kernel memory accounting.
652 nobpf -- Disable BPF memory accounting.
657 0 -- check protection applied by kernel (includes
659 1 -- check protection requested by application.
671 numbers X. Note the Linux-specific bits are not necessarily
672 stable over kernel options, but the vendor-specific
692 force such clocks to be always-on nor does it reserve
696 information, see Documentation/driver-api/clk.rst.
698 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
715 [X86-32] pit,hpet,tsc;
722 [X86-64] hpet,tsc
728 architected timer so that code using WFE-based polling
742 clocksource-wdtest.holdoff= [KNL]
748 cma=nn[MG]@[start[MG][-end[MG]]]
759 Sets the size of kernel per-numa memory area for
761 per-numa CMA altogether. And If this option is not
763 With per-numa CMA enabled, DMA users on node nid will
790 com20020= [HW,NET] ARCnet - COM20020 chipset
792 <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]]
794 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
798 ARCnet - COM90xx chipset (memory-mapped buffers)
827 See Documentation/admin-guide/serial-console.rst for more
842 $ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
843 /sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
856 Start an early, polled-mode console on the 8250/16550
859 MMIO inter-register address stride is either 8-bit
860 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
864 the h/w is not re-initialized.
891 syscall, or to executing "dmesg -S --raw" or to reading
894 consoleblank= [KNL] The console blank (screen saver) timeout in
915 disable the cpuidle sub-system
921 disable the cpufreq sub-system
929 [X86,EARLY] Delay for N microsec between assert and de-assert
950 like Hyper-V, PowerPC (fadump) and AMD SEV-SNP.
955 memory region [offset, offset + size] for that kernel
958 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
959 under 4G first, and fall back to reserve region above
961 See Documentation/admin-guide/kdump/kdump.rst for further details.
966 start-[end] where start and end are both
968 Documentation/admin-guide/kdump/kdump.rst for an example.
971 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
973 Allow kernel to allocate physical memory region from top,
975 installed. Otherwise memory region will be allocated
979 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
981 physical memory region above 4G, that cause second kernel
985 for 32-bit devices won't run out. Kernel would try to allocate
988 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
989 --> arm64: 128MiB
990 --> riscv: 128MiB
991 --> loongarch: 128MiB
1021 [KNL] Disable crypto self-tests
1029 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
1044 See also Documentation/input/devices/joystick-parport.rst
1057 [KNL] verbose locking self-tests
1060 self-tests.
1062 (no extra messages), setting it to -1 (all bits set)
1063 will print _a_lot_ more information - normally only
1098 Format: { on, no-mount, off }
1100 no-mount:
1105 get a -EPERM as result when trying to register files
1109 Default value is set in build-time with a kernel configuration.
1121 Documentation/admin-guide/mm/hugetlbpage.rst.
1125 [KNL] Debugging option to set a timeout in seconds for
1128 drivers) that have opted in will be ignored. A timeout
1129 of 0 will timeout at the end of initcalls. If the time
1135 delayacct [KNL] Enable per-task delay accounting
1221 entries for DMA-API debugging code. One entry is
1222 required per DMA-API allocation. Use this if the
1223 DMA-API debugging code disables itself because the
1227 With this option the DMA-API debugging driver
1251 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1276 Control how the dt_cpu_ftrs device-tree binding is
1286 what data is available or for reverse-engineering.
1291 Documentation/admin-guide/dynamic-debug-howto.rst
1302 determined by stdout-path property in device tree's
1307 Start an early, polled-mode console on a Cadence
1318 Start an early, polled-mode console on the 8250/16550
1320 MMIO inter-register address stride is either 8-bit
1321 (mmio) or 32-bit (mmio32 or mmio32be).
1331 Start an early, polled-mode console on a pl011 serial
1335 the driver will use only 32-bit accessors to read/write
1344 Start an early, polled-mode console on a meson serial
1350 Start an early, polled-mode console on an msm serial
1356 Start an early, polled-mode console on an msm serial
1362 Start an early, polled-mode console on a serial port
1368 Start an early, polled-mode console on a serial port
1374 Use RISC-V SBI (Supervisor Binary Interface) for early
1392 Start an early, polled-mode console on a lantiq serial
1406 Start an early, polled-mode, output-only console on the
1411 Start an early, polled-mode console on the
1417 Start an early, polled-mode console on a Qualcomm
1425 coherent non-x86 systems that use system memory for
1528 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1545 elanfreq= [X86-32]
1553 See Documentation/admin-guide/kdump/kdump.rst for details.
1569 0 -- permissive (log only, no denials).
1570 1 -- enforcing (deny and log).
1603 See also Documentation/fault-injection/.
1607 See Documentation/admin-guide/sysctl/net.rst for
1611 See Documentation/admin-guide/blockdev/floppy.rst.
1613 forcepae [X86-32]
1620 fred= [X86-64]
1671 ftrace_filter=[function-list]
1673 tracer at boot up. function-list is a comma-separated
1678 ftrace_notrace=[function-list]
1680 function-list. This list can be changed at run time
1684 ftrace_graph_filter=[function-list]
1687 function-list is a comma-separated list of functions
1691 ftrace_graph_notrace=[function-list]
1693 function-list. This list is a comma-separated list of
1713 off -- Don't create device links from firmware info.
1714 permissive -- Create device links from firmware info
1717 on -- Create device links from firmware info and use it
1719 rpm -- Like "on", but also use to order runtime PM.
1731 Format: { strict | timeout }
1732 strict -- Default. Continue waiting on consumers to
1734 timeout -- Give up waiting on consumers and call
1744 See also Documentation/input/devices/joystick-parport.rst
1748 gart_fix_e820= [X86-64,EARLY] disable the fix e820 for K8 GART
1774 gcov_persist= [GCOV] When non-zero (default), profiling data for
1784 gpio-mockup.gpio_mockup_ranges
1787 gpio-mockup.gpio_mockup_named_lines
1819 against bounds-checking flaws in the kernel's
1827 [KNL] Should the hard-lockup detector generate
1843 auto - Hash pointers unless slab_debug is enabled.
1844 always - Always hash pointers (even if slab_debug is
1846 never - Never hash pointers. This option should only
1854 for 64-bit NUMA, off otherwise.
1862 corresponding firmware-first mode error processing
1872 during restoration read-only).
1916 hpet= [X86-32,HPET] option to control HPET usage
1933 number of pages to allocate per-node can be specified.
1934 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1945 Documentation/admin-guide/mm/hugetlbpage.rst.
1955 Note that this parameter only applies to non-gigantic huge pages.
1965 boot-time allocation of gigantic hugepages is skipped.
2000 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
2006 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
2028 Set device-properties for ACPI-enumerated I2C-attached
2029 touchscreen, to e.g. fix coordinates of upside-down
2037 Omit "=<val>" entirely Set a boolean device-property
2038 Unsigned number Set a u32 device-property
2039 Anything else Set a string device-property
2042 i2c_touchscreen_props=GDIX1001:touchscreen-inverted-x:
2043 touchscreen-inverted-y
2045 i2c_touchscreen_props=MSSL1680:touchscreen-size-x=1920:
2046 touchscreen-size-y=1080:touchscreen-inverted-y:
2047 firmware-name=gsl1680-vendor-model.fw:silead,home-button
2052 (disabled by default, and as a pre-condition
2054 i8042.direct [HW] Put keyboard port into non-translated mode
2066 i8042.notimeout [HW] Ignore timeout condition signalled by controller
2068 suspend-to-ram transitions, only during s2r
2092 -1 -- never invert brightness
2093 0 -- machine default
2094 1 -- force brightness inversion
2096 ia32_emulation= [X86-64]
2098 When true, allows loading 32-bit programs and executing 32-bit
2123 idle=nomwait: Disable mwait for CPU C-states
2151 legacy only accept legacy-NaN binaries, if supported
2153 2008 only accept 2008-NaN binaries, if supported
2164 'relaxed' straps the emulator for both legacy-NaN and
2165 2008-NaN, whereas 'strict' enables legacy-NaN only on
2174 Ignore loglevel setting - this will print /all/
2241 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2242 "ima-sigv2" }
2243 Default: "ima-ng"
2281 stuff: Deploy RSB-fill mitigation when retpoline is
2286 Documentation/admin-guide/hw-vuln/indirect-target-selection.rst
2297 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2298 initcall functions. Useful for debugging built-in
2343 0 -- basic integrity auditing messages. (Default)
2344 1 -- additional integrity auditing messages.
2372 could harm performance of some high-throughput
2381 1 to 9 specify maximum depth of C-state.
2390 algorithms for p-state selection. There are two
2391 P-state selection algorithms provided by
2394 on whether or not the hardware managed P-states
2401 used along with the hardware-managed P-states (HWP)
2405 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2406 instead of acpi-cpufreq may disable platform features, such
2408 P-States information being indicated to OSPM and therefore
2411 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2424 Allow per-logical-CPU P-State performance control limits using
2427 Do not enable capacity-aware scheduling (CAS) on
2430 intremap= [X86-64,Intel-IOMMU,EARLY]
2435 BIOS x2APIC opt-out request will be ignored
2478 AMD Gart HW IOMMU-specific options:
2497 Do scatter-gather (SG) merging. Implies "force"
2501 Don't do scatter-gather (SG) merging.
2514 0 - Try to allocate a 32-bit DMA address first, before
2516 1 - Allocate directly from the full usable range,
2518 greater than 32-bit addressing.
2522 0 - Lazy mode.
2528 1 - Strict mode.
2531 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2533 legacy driver-specific options takes precedence.
2538 0 - Use IOMMU translation for DMA.
2539 1 - Bypass the IOMMU for DMA.
2540 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2542 io7= [HW] IO7 for Marvel-based Alpha systems
2557 See Documentation/admin-guide/nfs/nfsroot.rst.
2593 Enables support for pseudo-NMIs in the kernel. This
2598 [RISC-V,EARLY]
2600 as IPIs. Intended for system where IMSIC is trap-n-emulated,
2612 long-running IRQs in the system.
2624 [Deprecated - use cpusets instead]
2625 Format: [flag-list,]<cpu-list>
2658 "number of CPUs in system - 1".
2684 The format of <cpu-list> is described above.
2688 ivrs_ioapic [HW,X86-64]
2689 Provide an override to the IOAPIC-ID<->DEVICE-ID
2693 For example, to map IOAPIC-ID decimal 10 to
2699 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2702 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2706 ivrs_hpet [HW,X86-64]
2707 Provide an override to the HPET-ID<->DEVICE-ID
2711 For example, to map HPET-ID decimal 10 to
2717 * To map HPET-ID decimal 0 to PCI device 00:14.0
2720 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2724 ivrs_acpihid [HW,X86-64]
2725 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2729 For example, to map UART-HID:UID AMD0020:0 to
2735 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2738 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2762 the kernel for non-movable allocations. The requested
2772 subsystem. Note that allocations like PTEs-from-HighMem
2780 for non-movable allocations and remaining memory is used
2791 gdb or control-c on the dbgp connection. When
2792 not using this parameter you use sysrq-g to break into
2797 or a supported polling keyboard driver (non-usb).
2826 "0" | "off" | "n" - kexec handover is disabled
2827 "1" | "on" | "y" - kexec handover is enabled
2831 Defines the size of the KHO scratch region. The KHO
2833 ranges that can only be used for non-kernel
2844 parameter defines the size of additional per-node
2849 Configure the RouterBoard 532 series on-chip
2852 kmemleak= [KNL,EARLY] Boot-time kmemleak enable/disable
2858 kprobe_event=[probe-list]
2860 The probe-list is a semicolon delimited list of probe
2890 execution by eliminating the write-protection faults
2895 only to a small region of VM memory may benefit from
2917 virtualization on-demand when creating and destroying
2925 is that doing so may interfere with using out-of-tree
2952 back to huge pages. If the value is a non-zero N, KVM will
2957 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2960 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2961 a.k.a. Two-Dimensional Page Tables. Default is 1
2965 kvm-amd.ciphertext_hiding_asids=
2970 If ciphertext hiding is enabled, the joint SEV-ES and
2971 SEV-SNP ASID space is partitioned into separate SEV-ES
2972 and SEV-SNP ASID ranges, with the SEV-SNP range being
2973 [1..max_snp_asid] and the SEV-ES range being
2977 A non-zero value enables SEV-SNP ciphertext hiding and
2978 adjusts the ASID ranges for SEV-ES and SEV-SNP guests.
2979 KVM caps the number of SEV-SNP ASIDs at the maximum
2980 possible value, e.g. specifying -1u will assign all
2981 joint SEV-ES and SEV-SNP ASIDs to SEV-SNP. Note,
2982 assigning all joint ASIDs to SEV-SNP, i.e. configuring
2983 max_snp_asid == min_sev_asid-1, will effectively make
2984 SEV-ES unusable.
2986 kvm-arm.mode=
2992 nvhe: Standard nVHE-based mode, without support for
2999 nested: VHE-based mode with support for nested
3007 command-line.
3011 kvm-arm.vgic_v3_group0_trap=
3012 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0
3015 kvm-arm.vgic_v3_group1_trap=
3016 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-1
3019 kvm-arm.vgic_v3_common_trap=
3023 kvm-arm.vgic_v4_enable=
3027 kvm-arm.wfe_trap_policy=
3036 kvm-arm.wfi_trap_policy=
3053 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
3054 a.k.a. Two-Dimensional Page Tables. Default is 1
3058 kvm-intel.emulate_invalid_guest_state=
3060 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
3066 kvm-intel.flexpriority=
3071 kvm-intel.nested=
3075 kvm-intel.unrestricted_guest=
3081 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
3082 CVE-2018-3620.
3093 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
3113 on - enable the interface for the mitigation
3178 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
3184 lapic [X86-32,APIC,EARLY] Enable the local APIC even if BIOS
3188 value for LAPIC timer one-shot implementation. Default
3211 libata.force= [LIBATA] Force configurations. The format is a comma-
3223 first fan-out link behind PMP device. It does not
3237 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
3244 * rstonce: only attempt one reset during hot-unplug
3287 * external: Mark port as external (hotplug-capable).
3312 lockd.nlm_timeout=T [NFS] Assign timeout value.
3341 Specify the number of self-propagating call_rcu()
3349 occasional long-duration lock hold time. Defaults
3360 Set the number of locking read-acquisition kthreads.
3365 Set the number of locking write-acquisition kthreads.
3368 Set time (s) after boot for CPU-hotplug testing.
3371 Set time (s) between CPU-hotplug operations, or
3372 zero to disable CPU-hotplug testing.
3375 Do periodic testing of real-time lock priority
3380 non-real-time spinlocks, due to their disabling
3381 of preemption. Note that non-realtime mutexes
3394 Set task-shuffle interval (jiffies). Shuffling
3395 tasks allows some CPUs to go into dyntick-idle
3400 is useful for hands-off automated testing.
3419 Run the write-side locktorture kthreads at
3420 sched_set_fifo() real-time priority.
3438 7 (KERN_DEBUG) debug-level messages
3450 logo.nologo [FB] Disables display of the built-in Linux logo.
3468 an IEEE 1284-compliant printer is attached; if
3474 time-consuming boot-time autodetection (up to 250 ms per
3494 Example: machtype=lemote-yeeloong-2f-7inch
3506 (loop.max_loop) unconditionally pre-created at init time. The default
3509 devices can be requested on-demand with the
3510 /dev/loop-control interface.
3512 mce= [X86-{32,64}]
3549 do not opt-in to Local MCE delivery. Use legacy method
3566 sets the time in us to wait for other CPUs on machine
3570 don't overwrite the bios-set CMCI threshold. This boot
3579 force-enable recoverable machine check code paths
3585 See Documentation/admin-guide/md.rst.
3592 Control mitigation for the Micro-architectural Data
3607 full - Enable MDS mitigation on vulnerable CPUs
3608 full,nosmt - Enable MDS mitigation and disable
3610 off - Unconditionally disable MDS mitigation
3612 On TAA-affected machines, mds=off can be prevented by
3621 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3636 [ARC,MICROBLAZE] - the limit applies only to low memory,
3639 [ARM64] - only limits memory covered by the linear
3652 [ARM,MIPS,EARLY] - override the memory layout
3654 Define a memory region of size nn[KMG] starting at
3659 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3666 per-device physically contiguous DMA buffers.
3674 See Documentation/admin-guide/mm/memory-hotplug.rst.
3683 [KNL, X86,MIPS,XTENSA,EARLY] Force usage of a specific region of memory.
3684 Region of memory to be used is from ss to ss+nn.
3694 Region of memory to be marked is from ss to ss+nn.
3698 Region of memory to be reserved is from ss to ss+nn.
3699 Example: Exclude memory from 0x18690000-0x1869ffff
3709 Region of memory to be used, from ss to ss+nn.
3710 The memory region may be marked as e820 type 12 (0xc)
3713 memmap=<size>%<offset>-<oldtype>+<newtype>
3714 [KNL,ACPI,EARLY] Convert memory within the specified region
3715 from <oldtype> to <newtype>. If "-<oldtype>" is left
3716 out, the whole region will be marked as <newtype>,
3730 repeatable BIOS-originated corruption always
3774 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3780 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3784 s2idle - Suspend-To-Idle
3785 shallow - Power-On Suspend or equivalent (if supported)
3786 deep - Suspend-To-RAM or equivalent (if supported)
3787 See Documentation/admin-guide/pm/sleep-states.rst.
3789 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3799 base_rev=X - with <X> with format: <u32>
3813 0 - The attached screen is the 3.5" TFT
3814 1 - The attached screen is the 7" TFT
3815 2 - The VGA Shield is attached (1024x768)
3819 b - Enable backlight. The TFT backlight pin will be
3823 c - Enable the s3c camera interface.
3824 t - Reserved for enabling touchscreen support. The
3828 https://repo.or.cz/w/linux-2.6/mini2440.git
3833 arch-independent options, each of which is an
3834 aggregation of existing arch-specific options.
3864 ssbd=force-off [ARM64]
3878 have other ways of avoiding SMT-based attacks.
3892 supports attack-vector based controls as documented in
3893 Documentation/admin-guide/hw-vuln/attack_vector_controls.rst
3917 full - Enable mitigation on vulnerable CPUs
3919 full,nosmt - Enable mitigation and disable SMT on
3922 off - Unconditionally disable mitigation
3935 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3965 module_blacklist= [KNL] Do not load a comma-separated list of
3990 movable_node [KNL,EARLY] Boot-time switch to make hotplugable memory
3997 Format: <name>,<region-number>,<size>,<offset>
4000 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
4039 something different and driver-specific.
4059 [NFS] sets the timeout after which an attempt to
4079 [NFS] enable 64-bit inode numbers.
4080 If zero, the NFS client will fake up a 32-bit inode
4082 of returning the full 64-bit number.
4083 The default is to return 64-bit inode numbers.
4118 [NFS4] Specify an additional fixed unique ident-
4125 to a lease timeout on the server. Please note that
4149 driver. A non-zero value sets the minimum interval
4154 server-to-server copies for which this server is
4166 server-to-server copy, knfsd temporarily mounts
4173 See Documentation/admin-guide/nfs/nfsroot.rst.
4175 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
4176 See Documentation/admin-guide/nfs/nfsroot.rst.
4179 See Documentation/admin-guide/nfs/nfsroot.rst.
4183 NMI stack-backtrace request.
4192 0 - turn hardlockup detector in nmi_watchdog off
4193 1 - turn hardlockup detector in nmi_watchdog on
4194 rNNN - configure the watchdog with raw perf event 0xNNN
4197 timeout occurs (or 'nopanic' to not panic on an NMI
4201 This is useful when you use a panic=... timeout and
4207 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
4211 no4lvl [RISCV,EARLY] Disable 4-level and 5-level paging modes.
4212 Forces kernel to use 3-level paging instead.
4214 no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces
4215 kernel to use 4-level paging instead.
4250 no_entry_flush [PPC,EARLY] Don't flush the L1-D cache when entering the kernel.
4252 noexec32 [X86-64]
4253 This affects only 32-bit executables.
4254 noexec32=on: enable non-executable mappings (default)
4256 noexec32=off: disable non-executable mappings
4267 nofxsr [BUGS=X86-32] Disables x86 floating point extended
4269 legacy floating-point registers on task switch.
4314 nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
4316 [Deprecated - use intremap=off]
4322 noirqdebug [X86-32] Disables the code which attempts to detect and
4332 no-kvmapf [X86,KVM,EARLY] Disable paravirtualized asynchronous page
4335 no-kvmclock [X86,KVM,EARLY] Disable paravirtualized KVM clock driver
4337 nolapic [X86-32,APIC,EARLY] Do not enable or use the local APIC.
4339 nolapic_timer [X86-32,APIC,EARLY] Do not use the local APIC timer.
4341 nomce [X86-32] Disable Machine Check Exception
4343 nomfgpt [X86-32] Disable Multi-Function General Purpose
4349 not load if they could possibly displace the pre-
4352 perform display-mode changes or accelerated rendering.
4365 nopcid [X86-64,EARLY] Disable the PCID cpu feature.
4370 nopti [X86-64,EARLY]
4386 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
4392 no-scroll [VGA] Disables scrollback.
4393 This is required for the Braillex ib80-piezo Braille
4396 nosgx [X86-64,SGX,EARLY] Disables Intel SGX kernel support.
4416 nosoftlockup [KNL] Disable the soft-lockup detector.
4422 nospectre_bhb [ARM64,EARLY] Disable all mitigations for Spectre-BHB (branch
4435 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV,LOONGARCH,EARLY]
4442 timer IRQ sources, i.e., the IO-APIC timer. This can
4447 [PPC,EARLY] Don't flush the L1-D cache after accessing user data.
4460 no-vmw-sched-clock
4465 soft-lockup and NMI watchdog (hard-lockup).
4469 nox2apic [X86-64,APIC,EARLY] Do not enable x2APIC mode.
4477 enabling legacy floating-point and sse state.
4499 n. So during boot up some boot time memory for per-cpu
4500 variables need be pre-allocated for later physical cpu
4527 soft-reserved memory partitioning.
4536 See Documentation/admin-guide/sysctl/vm.rst for details.
4539 See Documentation/core-api/debugging-via-ohci1394.rst for more
4545 of the timeout. We have interrupts disabled while
4554 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4558 boundary - index of last SLC block on Flex-OneNAND.
4560 lock - Configure if Flex-OneNAND boundary should be locked.
4579 page_owner= [KNL,EARLY] Boot-time page_owner enabling option.
4585 page_poison= [KNL,EARLY] Boot-time parameter changing the state of
4597 panic= [KNL] Kernel behaviour on panic: delay <timeout>
4598 timeout > 0: seconds before rebooting
4599 timeout = 0: wait forever
4600 timeout < 0: reboot immediately
4601 Format: <timeout>
4613 See Documentation/admin-guide/tainted-kernels.rst for
4685 Set to non-zero to probe primary and secondary ISA
4691 Set to non-zero if a chip is present that snoops speed
4739 Set to non-zero to probe tertiary and further ISA
4755 Set to non-zero to probe QDI controllers. By default
4760 Set to non-zero to probe Winbond controllers. Use
4807 bios [X86-32] force use of PCI BIOS, don't access
4809 has a non-standard PCI host bridge.
4810 nobios [X86-32] disallow use of PCI BIOS, only direct
4816 data in IO port 0xCFC, both 32-bit).
4818 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4819 the function, IO port 0xCFA, also 8-bit, sets
4821 through ports 0xC000-0xCFFF).
4828 root domains (aka PCI segments, in ACPI-speak).
4836 disable the use of MSI interrupts system-wide.
4841 primary IO-APIC for bridges that cannot disable
4848 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4872 F0000h-100000h range.
4877 assign-busses [X86] Always assign all PCI bus
4898 <linux-pci@vger.kernel.org>.
4902 a bug to <linux-pci@vger.kernel.org>.
4914 bfsort Sort PCI devices into breadth-first order.
4917 nobfsort Don't sort PCI devices into breadth-first order.
4919 tuning and use the BIOS-configured MPS defaults.
4929 configuration allows peer-to-peer DMA between
4932 that hot-added devices will work.
4947 A PCI-PCI bridge can be specified if resource
4953 for 4096-byte alignment.
4955 end-to-end CRC checking). Only effective if
4986 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
5017 bit-0 : ACS Source Validation
5018 bit-1 : ACS Translation Blocking
5019 bit-2 : ACS P2P Request Redirect
5020 bit-3 : ACS P2P Completion Redirect
5021 bit-4 : ACS Upstream Forwarding
5022 bit-5 : ACS P2P Egress Control
5023 bit-6 : ACS Direct Translated P2P
5033 Validation unchanged from whatever power-up
5045 system-wide.
5059 dpc-native Use native PCIe service for DPC only. May
5076 Keep all power-domains already enabled by bootloader on,
5094 pirq= [SMP,APIC] Manual mp-table setup
5095 See Documentation/arch/x86/i386/IO-APIC.rst.
5099 See also Documentation/admin-guide/parport.rst.
5118 resume of devices during system-wide power transitions.
5120 dependencies are not well-defined, or for debugging
5130 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
5139 { on | off | curr | res | no-curr | no-res }
5184 none - Limited to cond_resched() calls
5185 voluntary - Limited to cond_resched() and might_sleep() calls
5186 full - Any section that isn't explicitly preempt disabled
5190 lazy - Scheduler controlled. Similar to full but instead
5196 print-fatal-signals=
5202 coredump - etc.
5205 you might want to try "ulimit -i unlimited".
5217 or lockdep-detected issues (only if lock debug is on).
5225 Allows storing messages from non-panic CPUs into
5227 flushed to consoles by the panic-CPU on
5228 a best-effort basis.
5234 on - unlimited logging to /dev/kmsg from userspace
5235 off - logging to /dev/kmsg disabled
5236 ratelimit - ratelimit the logging
5247 - 'always': traditional behavior always allows mem overrides.
5248 - 'ptrace': only allow mem overrides for active ptracers.
5249 - 'never': never allow mem overrides.
5253 Limit processor to maximum C-state
5257 Ignore the _CST method to determine C-states,
5264 Param: "schedule" - profile schedule points.
5265 Param: "kvm" - profile VM exits.
5266 Param: <number> - step/bucket size as a power of 2 for
5297 pti= [X86-64] Control Page Table Isolation of user and
5302 on - unconditionally enable
5303 off - unconditionally disable
5304 auto - kernel detects whether your CPU model is
5310 [KNL] Number of legacy pty's. Overwrites compiled-in
5322 See Documentation/admin-guide/md.rst.
5325 See Documentation/admin-guide/blockdev/ramdisk.rst.
5344 cross-syscall address exposures. This is only
5350 ras=option[,option,...] [KNL] RAS-specific options
5356 rcu_nocbs[=cpu-list]
5361 enable the no-callback CPU mode, which prevents
5366 "p" for RCU-preempt, "s" for RCU-sched, and "g"
5370 and real-time workloads. It can also improve
5374 list of CPUs is set to no-callback mode from boot.
5378 no-callback mode from boot but the mode may be
5389 This improves the real-time response for the
5400 Do only a one-line RCU CPU stall warning when
5401 there is an ongoing too-long CSD-lock wait.
5407 If triggered before the RCU grace-period machinery
5417 RCU grace-period cleanup.
5421 RCU grace-period initialization.
5425 RCU grace-period pre-initialization, that is,
5426 the propagation of recent CPU-hotplug changes up
5430 Set delay from grace-period initialization to
5443 soliciting quiescent-state help from
5455 Set the SCHED_FIFO priority of the RCU per-CPU
5458 and for the RCU grace-period kthreads (rcu_bh,
5460 set, valid values are 1-99 and the default is 1
5461 (the least-favored priority). Otherwise, when
5462 RCU_BOOST is not set, valid values are 0-99 and
5463 the default is zero (non-realtime operation).
5468 On callback-offloaded (rcu_nocbs) CPUs,
5471 use of the ->nocb_bypass list. However, in the
5472 common non-flooded case, RCU queues directly to
5473 the main ->cblist in order to avoid the extra
5474 overhead of the ->nocb_bypass list and its lock.
5476 a single jiffy, RCU pre-queues the callbacks into
5477 the ->nocb_bypass queue. The definition of "too
5481 On callback-offloaded (rcu_nocbs) CPUs, avoid
5494 batch limiting is re-enabled.
5498 RCU's force-quiescent-state scan will aggressively
5506 Set the page-cache refill delay (in milliseconds)
5507 in response to low-memory conditions. The range
5511 Set the shift-right count to use to compute
5512 the callback-invocation batch limit bl from
5519 Please note that this callback-invocation batch
5520 limit applies only to non-offloaded callback
5529 cache-to-cache transfer latencies.
5535 and for NUMA systems with large remote-access
5551 the wakeup overhead on the global grace-period
5553 each group's NOCB grace-period kthread.
5556 Cause the grace-period kthread to get an extra
5558 it should at force-quiescent-state time.
5571 this specifies an rcu_read_unlock()-time delay
5575 of RCU-protected pointers after the relevant
5585 per-CPU rcuc kthreads. Defaults to a non-zero
5615 grace-period primitives such as call_rcu().
5626 grace-period primitives.
5629 Set test-start holdoff period. The purpose of
5647 Test the double-argument variant of kfree_rcu().
5649 rcuscale.kfree_rcu_test_single, both the single-
5650 and double-argument variants are tested.
5653 Test the single-argument variant of kfree_rcu().
5655 rcuscale.kfree_rcu_test_double, both the single-
5656 and double-argument variants are tested.
5670 does not affect the data-collection interval,
5675 Set number of RCU readers. The value -1 selects
5677 "n" less than -1 selects N-n+1, where N is again
5678 the number of CPUs. For example, -2 selects N
5679 (the number of CPUs), -3 selects N+1, and so on.
5680 A value of "n" less than or equal to -N selects
5693 complete. This is useful for hands-off automated
5700 Write-side holdoff between grace periods,
5705 Additional write-side holdoff between grace
5723 for RCU grace-period forward-progress testing
5730 Specify the fraction of a CPU-stall-warning
5731 period to do tight-loop forward-progress testing.
5735 forward-progress tests.
5739 need_resched() during tight-loop forward-progress
5743 Use conditional/asynchronous update-side
5744 normal-grace-period primitives, if available.
5747 Use conditional/asynchronous update-side
5748 expedited-grace-period primitives, if available.
5751 Use conditional/asynchronous update-side
5752 normal-grace-period primitives that also take
5757 Use conditional/asynchronous update-side
5758 expedited-grace-period primitives that also take
5782 Use expedited update-side primitives, if available.
5785 Use normal (non-expedited) asynchronous
5786 update-side primitives, if available.
5789 Use polled update-side normal-grace-period
5793 Use polled update-side expedited-grace-period
5797 Use polled update-side normal-grace-period
5802 Use polled update-side expedited-grace-period
5826 Use normal (non-expedited) synchronous
5827 update-side primitives, if available. If all
5831 they are all non-zero.
5834 Enable grace-period wrap lag testing. Setting
5839 Set the value for grace-period wrap lag during
5854 the grace-period wrap lag will be set to the
5864 Leak an RCU-protected pointer out of the reader.
5879 Set number of RCU callback-offload togglers.
5884 callback-offload toggling attempts.
5887 Set number of RCU readers. The value -1 selects
5888 N-1, where N is the number of CPUs. A value
5889 "n" less than -1 selects N-n-2, where N is again
5890 the number of CPUs. For example, -2 selects N
5891 (the number of CPUs), -3 selects N+1, and so on.
5894 Enable debug-object double-call_rcu() testing.
5897 Set time (s) after boot for CPU-hotplug testing.
5900 Set time (jiffies) between CPU-hotplug operations,
5901 or zero to disable CPU-hotplug testing.
5905 by a high-priority FIFO real-time task. Set to
5914 second) between preemptions by a high-priority
5915 FIFO real-time task. This delay is mediated
5920 The number of times in a given read-then-exit
5921 episode that a set of read-then-exit kthreads
5926 read-then-exit testing episodes.
5931 are entered from low-order bit up, and are
5933 0x1 bit is normal readers, 0x2 NMI-safe readers,
5934 and 0x4 light-weight readers.
5937 Set task-shuffle interval (s). Shuffling tasks
5938 allows some CPUs to go into dyntick-idle mode
5943 is useful for hands-off automated testing.
5952 any other stall-related activity. Note that
5958 in scheduling-while-atomic splats.
5977 grace-period kthread to test RCU CPU stall
6001 of RCU priority-boost testing. Defaults to zero,
6008 Test RCU's dyntick-idle handling. See also the
6037 Set timeout for RCU CPU stall warning messages.
6042 Set timeout for expedited RCU CPU stall warning
6055 begin at half of the first RCU stall timeout.
6063 Use expedited grace-period primitives, for
6067 real-time latency, and degrade energy efficiency.
6071 Use only normal grace-period primitives,
6074 real-time latency, CPU utilization, and
6076 increased grace-period latency. This parameter
6083 only normal grace-period primitives. No effect
6089 post-boot attempt at an expedited RCU grace
6090 period to instead use normal non-expedited
6091 grace-period processing.
6099 set to the default value of -1.
6102 Set the minimum number of callback-queuing-time
6103 lock-contention events per jiffy required to
6104 cause the RCU Tasks flavors to switch to per-CPU
6107 the default value of -1.
6112 of -1 allows this to be automatically (and
6120 number avoids disturbing real-time workloads,
6125 cancel laziness on that CPU. Use -1 to disable
6131 Set initial timeout in jiffies for RCU task stall
6135 only printed prior to the stall-warning message
6153 Set timeout in jiffies for RCU task stall
6160 Set timeout in milliseconds RCU Tasks asynchronous
6167 Set timeout in milliseconds RCU Tasks
6183 force - Override the decision by the kernel to hide the
6222 There are some built-in platform specific "quirks"
6223 - you may see: "reboot: <name> series board detected.
6227 built-in quirk table, and use the generic default
6260 Set test-start holdoff period. The purpose of
6275 but the default has already reduced the per-pass
6280 Set number of readers. The default value of -1
6289 Set the read-side critical-section duration,
6293 Specify the read-protection implementation to test.
6319 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
6324 them. If <base> is less than 0x10000, the region
6349 reservetop= [X86-32,EARLY]
6366 See Documentation/power/swsusp-and-swap-files.rst
6382 AMD-based UNRET and IBPB mitigations alone do not stop
6384 sibling threads. For that reason, STIBP is used on pro-
6388 off - no mitigation
6389 auto - automatically select a migitation
6390 auto,nosmt - automatically select a mitigation,
6394 ibpb - On AMD, mitigate short speculation
6399 ibpb,nosmt - Like "ibpb" above but will disable SMT
6403 unret - Force enable untrained return thunks,
6404 only effective on AMD f15h-f17h based
6406 unret,nosmt - Like unret, but will disable SMT when STIBP
6438 ro [KNL] Mount root device read-only on boot
6441 on Mark read-only kernel memory as read-only (default).
6442 off Leave read-only kernel memory writable for debugging.
6443 noalias Mark read-only kernel memory as read-only but retain
6451 debug-uart get routed to the D+ and D- pins of the usb
6457 block/early-lookup.c for details.
6490 rw [KNL] Mount root device read-write on boot
6519 solution to mutex-based priority inversion.
6549 to 10 seconds for built-in smp_call_function()
6556 that requesting even small non-zero numbers of
6563 The default of -1 specifies a number of kthreads
6568 test before initiating CPU-hotplug operations.
6572 CPU-hotplug operations. Specifying zero (which
6573 is the default) disables CPU-hotplug operations.
6579 Non-zero values are useful for automated tests.
6602 "wait" parameter. A value of -1 selects the
6603 default if all other weights are -1. However,
6605 value of -1 will instead select a weight of zero.
6610 non-zero "wait" parameter. See weight_single.
6623 non-zero "wait" parameter. See weight_single
6635 non-zero "wait" parameter. See weight_single
6646 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
6647 1 -- enable.
6658 0 -- disable.
6659 1 -- enable.
6662 serialnumber [BUGS=X86-32]
6664 sev=option[,option...] [X86-64]
6670 Do not enable SEV-SNP (applies to host/hypervisor
6673 SEV-SNP guests.
6681 to set it to "all" by meaning -- no limit here.
6693 Documentation/admin-guide/mm/slab.rst.
6704 Documentation/admin-guide/mm/slab.rst.
6720 Documentation/admin-guide/mm/slab.rst.
6726 Documentation/admin-guide/mm/slab.rst.
6741 Documentation/admin-guide/mm/slab.rst.
6768 using the csdlock_debug- kernel parameter.
6773 system. By default, let CSD-lock acquisition
6775 for this value provides a 5-minute timeout.
6777 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
6778 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
6779 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
6780 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
6781 smsc-ircc2.ircc_irq= [HW] IRQ line
6782 smsc-ircc2.ircc_dma= [HW] DMA channel
6783 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
6793 Default: -1 (no limit)
6796 [KNL] Should the soft-lockup detector generate panics.
6799 A value of 1 instructs the soft-lockup detector
6800 to panic the machine when a soft-lockup occurs. It is
6803 respective build-time switch to that functionality.
6806 [KNL] Should the soft-lockup detector generate
6811 See Documentation/admin-guide/laptops/sonypi.rst
6818 on - (default) Enable the HW or SW mitigation as
6821 vmexit - On systems which don't have the HW mitigation
6824 protected from VM-originated BHI attacks, but
6826 off - Disable the mitigation.
6833 on - unconditionally enable, implies
6835 off - unconditionally disable, implies
6837 auto - kernel detects whether your CPU model is
6856 retpoline - replace indirect branches
6857 retpoline,generic - Retpolines
6858 retpoline,lfence - LFENCE; indirect branch
6859 retpoline,amd - alias for retpoline,lfence
6860 eibrs - Enhanced/Auto IBRS
6861 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
6862 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
6863 ibrs - use IBRS to protect kernel
6873 on - Unconditionally enable mitigations. Is
6876 off - Unconditionally disable mitigations. Is
6879 prctl - Indirect branch speculation is enabled,
6885 - Like "prctl" above, but only STIBP is
6891 - Same as "prctl" above, but all seccomp
6896 - Like "seccomp" above, but only STIBP is
6901 auto - Kernel selects the mitigation depending on
6912 off - Disable mitigation
6913 microcode - Enable microcode mitigation only
6914 safe-ret - Enable sw-only safe RET mitigation (default)
6915 ibpb - Enable mitigation by issuing IBPB on
6917 ibpb-vmexit - Issue IBPB only on VMEXIT
6918 (cloud-specific mitigation)
6943 on - Unconditionally disable Speculative Store Bypass
6944 off - Unconditionally enable Speculative Store Bypass
6945 auto - Kernel detects whether the CPU model contains an
6951 prctl - Control Speculative Store Bypass per thread
6955 seccomp - Same as "prctl" above, but all seccomp threads
6963 on,auto - On Power8 and Power9 insert a store-forwarding
6967 off - No action.
6981 off - not enabled
6983 warn - the kernel will emit rate-limited warnings
6991 fatal - the kernel will send SIGBUS to applications
6996 ratelimit:N -
7016 Certain CPUs are vulnerable to an MDS-like
7036 This kernel-boot parameter defaults to 128,
7037 but takes effect only when the low-order four
7054 instead of the compile-time CONFIG_NR_CPUS.
7058 grace-period sequence counter wrap for the
7059 srcu_data structure's ->srcu_gp_seq_needed field.
7074 Specifies the number of no-delay instances
7081 Specifies the per-grace-period phase, number of
7082 non-sleeping polls of readers. Beyond this limit,
7088 Specifies number of microseconds of non-sleeping
7089 delay between each non-sleeping poll of readers.
7092 Specifies the number of update-side contention
7097 set for contention-based conversions to occur.
7107 force-on: Unconditionally enable mitigation for
7109 force-off: Unconditionally disable mitigation for
7131 stack traces. Pools are allocated on-demand up to this
7137 stacktrace_filter=[function-list]
7139 will trace at boot up. function-list is a comma-separated
7147 Set the STI (builtin display/keyboard on the HP-PARISC
7149 as the initial boot-console.
7209 to global on non-NUMA machines)
7234 <int> -- Number of I/O TLB slabs
7235 <int> -- Second integer after comma. Number of swiotlb
7238 force -- force using of bounce buffers even if they
7240 noforce -- Never use bounce buffers (for debugging)
7255 Ignore sysrq setting - this boot parameter will
7263 cache size. See Documentation/networking/ip-sysctl.rst
7269 Format: { "mem" | "standby" | "freeze" }[,N]
7270 Specify "mem" (for Suspend-to-RAM) or "standby" (for
7271 standby suspend) or "freeze" (for suspend type freeze)
7275 wakeup-capable RTC alarm.
7281 -1: disable all active trip points in all thermal zones
7285 -1: disable all critical trip points in all thermal zones
7292 -1: disable all passive trip points
7298 <deci-seconds>: poll all this frequency
7302 Format: <size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>
7307 See Documentation/admin-guide/mm/transhuge.rst for more
7315 Format: <size>[KMG],<size>[KMG]:<policy>;<size>[KMG]-<size>[KMG]:<policy>
7321 See Documentation/admin-guide/mm/transhuge.rst for more
7333 Prevent the CPU-hotplug component of torturing
7337 Dump the ftrace buffer at torture-test shutdown,
7341 with rotating-rust storage.
7346 disables verbose-printk() sleeping.
7349 Duration of each verbose-printk() sleep in jiffies.
7382 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
7420 local - Use the per CPU time stamp counter
7424 global - Event time stamps are synchronized across
7427 counter - Simple counting of events (1, 2, ..)
7431 uptime - Use jiffies as the time stamp.
7432 perf - Use the same clock that perf uses.
7433 mono - Use ktime_get_mono_fast_ns() for time stamps.
7434 mono_raw - Use ktime_get_raw_fast_ns() for time
7436 boot - Use ktime_get_boot_fast_ns() for time stamps.
7440 trace_event=[event-list]
7442 to facilitate early boot debugging. The event-list is a
7443 comma-separated list of trace events to enable. See
7454 trace_instance=[instance-info]
7479 traceoff - Have the tracing instance tracing disabled after it is created.
7480 traceprintk - Have trace_printk() write into this trace instance
7527 trace_options=[option-list]
7529 The option-list is a comma delimited list of options
7543 trace_trigger=[trigger-list]
7589 See Documentation/admin-guide/mm/transhuge.rst
7596 See Documentation/admin-guide/mm/transhuge.rst
7603 See Documentation/admin-guide/mm/transhuge.rst
7611 - "tpm"
7612 - "tee"
7613 - "caam"
7614 - "dcp"
7624 - "kernel"
7625 - the same value as trusted.source: "tpm" or "tee"
7626 - "default"
7649 off - disable the mitigation
7650 on - enable the mitigation (default)
7651 user - mitigate only user/kernel transitions
7652 vm - mitigate only guest/host transitions
7660 high-resolution timer mode on older hardware, and in
7696 on - Enable TSX on the system. Although there are
7699 several previous speculation-related CVEs, and
7703 off - Disable TSX on the system. (Note that this
7711 auto - Disable TSX if X86_BUG_TAA is present,
7716 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7722 Similar to Micro-architectural Data Sampling (MDS)
7737 full - Enable TAA mitigation on vulnerable CPUs
7740 full,nosmt - Enable TAA mitigation and disable SMT on
7743 vulnerable to cross-thread TAA attacks.
7744 off - Unconditionally disable TAA mitigation
7746 On MDS-affected machines, tsx_async_abort=off can be
7758 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7764 See also Documentation/input/devices/joystick-parport.rst
7766 udbg-immortal [PPC] When debugging early kernel crashes that
7772 Set number of hash buckets for UDP/UDP-Lite connections
7774 uhci-hcd.ignore_oc=
7776 Some badly-designed motherboards generate lots of
7801 unwind_debug [X86-64,EARLY]
7809 (default -1 = authorized (same as 1),
7815 for newly-detected USB devices (default 2). This
7843 [USB] Specifies timeout for the initial 64-byte
7850 [USB] A list of quirk entries to augment the built-in
7853 VendorID:ProductID:Flags. The IDs are 4-digit hex
7855 will change the built-in quirk; setting it if it is
7860 a 255-byte read);
7864 Set-Interface requests);
7883 (bInterval-1).
7908 (Reduce timeout of the SET_ADDRESS
7921 usb-storage.delay_use=
7928 usb-storage.quirks=
7930 override the built-in unusual_devs list. List
7933 and Product ID values (4-digit hex numbers) and
7935 to a common usb-storage quirk flag as follows:
7977 medium is write-protected).
7986 1 - undefined instruction events
7987 2 - system calls
7988 4 - invalid data aborts
7989 8 - SIGSEGV faults
7990 16 - SIGBUS faults
7999 vdso32= [X86] Control the 32-bit vDSO
8000 vdso32=1: enable 32-bit VDSO
8001 vdso32=0 or vdso32=2: disable 32-bit VDSO
8011 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
8042 vga= [BOOT,X86-32] Select a particular video mode
8044 Documentation/admin-guide/svga.rst.
8059 - Disable all of the above options
8085 hypervisor to a guest via speculative side-channels.
8087 off - disable the mitigation
8088 ibpb - use Indirect Branch Prediction Barrier
8090 force - force vulnerability detection even on
8093 vsyscall= [X86-64,EARLY]
8096 code). Most statically-linked binaries and older
8120 see vga-softcursor.rst. Default: 2 = underline.
8125 This is a 16-member array composed of values
8126 ranging from 0-255.
8131 This is a 16-member array composed of values
8132 ranging from 0-255.
8137 This is a 16-member array composed of values
8138 ranging from 0-255.
8143 Set system-wide default UTF-8 mode for all tty's.
8144 Default is 1, i.e. UTF-8 mode is enabled for all
8149 Format=<-1|0|1>
8150 Set system-wide default for whether a cursor
8151 is shown on new VTs. Default is -1,
8156 vt.italic= [VT] Default color for italic text; 0-15.
8159 vt.underline= [VT] Default color for underlined text; 0-15.
8163 see Documentation/watchdog/watchdog-parameters.rst
8164 or other driver-specific files in the
8178 Format: <cpu-list>
8199 Per-cpu work items which run for longer than this
8202 them from noticeably delaying other per-cpu work
8220 Per-cpu workqueues are generally preferred because
8222 locality; unfortunately, per-cpu workqueues tend to
8225 Enabling this makes the per-cpu workqueues which
8239 Documentation/core-api/workqueue.rst.
8252 forces round-robin CPU selection to flush out
8260 on - Enable writecombine, use WUC for ioremap_wc()
8261 off - Disable writecombine, use SUC for ioremap_wc()
8263 x2apic_phys [X86-64,APIC,EARLY] Use x2apic physical mode instead of
8267 xen_512gb_limit [KNL,X86-64,XEN]
8277 ide-disks -- unplug primary master IDE devices
8278 aux-ide-disks -- unplug non-primary-master IDE devices
8279 nics -- unplug network devices
8280 all -- unplug all emulated devices (NICs and IDE disks)
8281 unnecessary -- unplugging emulated devices is
8284 never -- do not unplug even if version check succeeds
8298 Select whether to always use non-faulting (safe) MSR
8318 xen_timer_slop= [X86-64,XEN,EARLY]
8343 preferred over the 2-level event handling, as it is
8360 xive.store-eoi=off [PPC]
8366 xhci-hcd.quirks [USB,KNL]