diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 78 |
1 files changed, 63 insertions, 15 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 09126bb8cc9f..8337d0fed311 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -333,12 +333,17 @@ allowed anymore to lift isolation requirements as needed. This option does not override iommu=pt - force_enable - Force enable the IOMMU on platforms known - to be buggy with IOMMU enabled. Use this - option with care. - pgtbl_v1 - Use v1 page table for DMA-API (Default). - pgtbl_v2 - Use v2 page table for DMA-API. - irtcachedis - Disable Interrupt Remapping Table (IRT) caching. + force_enable - Force enable the IOMMU on platforms known + to be buggy with IOMMU enabled. Use this + option with care. + pgtbl_v1 - Use v1 page table for DMA-API (Default). + pgtbl_v2 - Use v2 page table for DMA-API. + irtcachedis - Disable Interrupt Remapping Table (IRT) caching. + nohugepages - Limit page-sizes used for v1 page-tables + to 4 KiB. + v2_pgsizes_only - Limit page-sizes used for v1 page-tables + to 4KiB/2Mib/1GiB. + amd_iommu_dump= [HW,X86-64] Enable AMD IOMMU driver option to dump the ACPI table @@ -517,6 +522,18 @@ Format: <io>,<irq>,<mode> See header of drivers/net/hamradio/baycom_ser_hdx.c. + bdev_allow_write_mounted= + Format: <bool> + Control the ability to open a mounted block device + for writing, i.e., allow / disallow writes that bypass + the FS. This was implemented as a means to prevent + fuzzers from crashing the kernel by overwriting the + metadata underneath a mounted FS without its awareness. + This also prevents destructive formatting of mounted + filesystems by naive storage tooling that don't use + O_EXCL. Default is Y and can be changed through the + Kconfig option CONFIG_BLK_DEV_WRITE_MOUNTED. + bert_disable [ACPI] Disable BERT OS support on buggy BIOSes. @@ -2350,6 +2367,18 @@ ipcmni_extend [KNL,EARLY] Extend the maximum number of unique System V IPC identifiers from 32,768 to 16,777,216. + ipe.enforce= [IPE] + Format: <bool> + Determine whether IPE starts in permissive (0) or + enforce (1) mode. The default is enforce. + + ipe.success_audit= + [IPE] + Format: <bool> + Start IPE with success auditing enabled, emitting + an audit event when a binary is allowed. The default + is 0. + irqaffinity= [SMP] Set the default irq affinity mask The argument is a cpu list, as described above. @@ -4788,6 +4817,16 @@ printk.time= Show timing data prefixed to each printk message line Format: <bool> (1/Y/y=enable, 0/N/n=disable) + proc_mem.force_override= [KNL] + Format: {always | ptrace | never} + Traditionally /proc/pid/mem allows memory permissions to be + overridden without restrictions. This option may be set to + restrict that. Can be one of: + - 'always': traditional behavior always allows mem overrides. + - 'ptrace': only allow mem overrides for active ptracers. + - 'never': never allow mem overrides. + If not specified, default is the CONFIG_PROC_MEM_* choice. + processor.max_cstate= [HW,ACPI] Limit processor to maximum C-state max_cstate=9 overrides any DMI blacklist limit. @@ -4935,6 +4974,10 @@ Set maximum number of finished RCU callbacks to process in one batch. + rcutree.csd_lock_suppress_rcu_stall= [KNL] + Do only a one-line RCU CPU stall warning when + there is an ongoing too-long CSD-lock wait. + rcutree.do_rcu_barrier= [KNL] Request a call to rcu_barrier(). This is throttled so that userspace tests can safely @@ -5382,7 +5425,13 @@ Time to wait (s) after boot before inducing stall. rcutorture.stall_cpu_irqsoff= [KNL] - Disable interrupts while stalling if set. + Disable interrupts while stalling if set, but only + on the first stall in the set. + + rcutorture.stall_cpu_repeat= [KNL] + Number of times to repeat the stall sequence, + so that rcutorture.stall_cpu_repeat=3 will result + in four stall sequences. rcutorture.stall_gp_kthread= [KNL] Duration (s) of forced sleep within RCU @@ -5570,14 +5619,6 @@ of zero will disable batching. Batching is always disabled for synchronize_rcu_tasks(). - rcupdate.rcu_tasks_rude_lazy_ms= [KNL] - Set timeout in milliseconds RCU Tasks - Rude asynchronous callback batching for - call_rcu_tasks_rude(). A negative value - will take the default. A value of zero will - disable batching. Batching is always disabled - for synchronize_rcu_tasks_rude(). - rcupdate.rcu_tasks_trace_lazy_ms= [KNL] Set timeout in milliseconds RCU Tasks Trace asynchronous callback batching for @@ -7352,6 +7393,13 @@ it can be updated at runtime by writing to the corresponding sysfs file. + workqueue.panic_on_stall=<uint> + Panic when workqueue stall is detected by + CONFIG_WQ_WATCHDOG. It sets the number times of the + stall to trigger panic. + + The default is 0, which disables the panic on stall. + workqueue.cpu_intensive_thresh_us= Per-cpu work items which run for longer than this threshold are automatically considered CPU intensive |