Pnina Feder 2e171ab29f panic: add panic_force_cpu= parameter to redirect panic to a specific CPU ... Some platforms require panic handling to execute on a specific CPU for crash dump to work reliably. This can be due to firmware limitations, interrupt routing constraints, or platform-specific requirements where only a single CPU is able to safely enter the crash kernel. Add the panic_force_cpu= kernel command-line parameter to redirect panic execution to a designated CPU. When the parameter is provided, the CPU that initially triggers panic forwards the panic context to the target CPU via IPI, which then proceeds with the normal panic and kexec flow. The IPI delivery is implemented as a weak function (panic_smp_redirect_cpu) so architectures with NMI support can override it for more reliable delivery. If the specified CPU is invalid, offline, or a panic is already in progress on another CPU, the redirection is skipped and panic continues on the current CPU. [pnina.feder@mobileye.com: fix unused variable warning] Link: https://lkml.kernel.org/r/20260126122618.2967950-1-pnina.feder@mobileye.com Link: https://lkml.kernel.org/r/20260122102457.1154599-1-pnina.feder@mobileye.com Signed-off-by: Pnina Feder <pnina.feder@mobileye.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Cc: Baoquan He <bhe@redhat.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mel Gorman <mgorman@suse.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2026-02-03 08:21:26 -08:00
..
bpf	bpf: explicitly align bpf_res_spin_lock	2026-01-26 19:07:14 -08:00
cgroup	kernel: cgroup: Add LGPL-2.1 SPDX license ID to legacy_freezer.c	2026-01-15 22:03:15 -10:00
configs	watchdog: softlockup: panic when lockup duration exceeds N thresholds	2026-01-20 19:44:20 -08:00
debug	kernel.h: drop hex.h and update all hex.h users	2026-01-20 19:44:19 -08:00
dma	dma/pool: Avoid allocating redundant pools	2026-01-14 11:00:00 +01:00
entry	rseq: Switch to TIF_RSEQ if supported	2025-11-04 08:35:37 +01:00
events	Fix perf swevent hrtimer deinit regression.	2026-01-11 06:55:27 -10:00
futex	Futex changes for v6.19:	2025-12-10 17:21:30 +09:00
gcov	gcov: add support for GCC 15	2025-11-09 21:19:44 -08:00
irq	treewide: Update email address	2026-01-11 06:09:11 -10:00
kcsan	kernel: fix off-by-one benign bugs	2026-01-20 19:44:19 -08:00
livepatch	livepatching changes for 6.19	2025-12-03 13:46:48 -08:00
liveupdate	kho: skip memoryless NUMA nodes when reserving scratch areas	2026-01-31 16:16:08 -08:00
locking	RCU pull request for v6.19	2025-12-03 12:18:07 -08:00
module	module: add helper function for reading module_buildid()	2026-01-20 19:44:22 -08:00
power	Merge branch 'pm-em'	2026-01-16 16:16:24 +01:00
printk	printk fixup for 6.19 rc6	2026-01-16 09:46:59 -08:00
rcu	RCU pull request for v6.19	2025-12-03 12:18:07 -08:00
sched	delayacct: add timestamp of delay max	2026-01-31 16:16:06 -08:00
time	hrtimer: Fix softirq base check in update_needs_ipi()	2026-01-13 11:04:41 +01:00
trace	tracing: remove size parameter in __trace_puts()	2026-01-31 16:16:05 -08:00
unwind	unwind_user/x86: Teach FP unwind about start of function	2025-10-29 10:29:58 +01:00
.gitignore	kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute	2025-06-24 20:30:37 +09:00
acct.c	act: use credential guards in acct_write_process()	2025-11-04 12:36:49 +01:00
async.c
audit.c	kernel.h: drop hex.h and update all hex.h users	2026-01-20 19:44:19 -08:00
audit.h	audit: fix comment misindentation in audit.h	2025-10-22 19:28:06 -04:00
audit_fsnotify.c	VFS/audit: introduce kern_path_parent() for audit	2025-09-23 12:37:35 +02:00
audit_tree.c	mount-related stuff for this cycle	2025-10-03 10:19:44 -07:00
audit_watch.c	VFS/audit: introduce kern_path_parent() for audit	2025-09-23 12:37:35 +02:00
auditfilter.c	audit: Use kzalloc() instead of kmalloc()/memset() in audit_krule_to_data()	2025-11-07 16:38:34 -05:00
auditsc.c	audit: merge loops in __audit_inode_child()	2025-11-07 16:50:42 -05:00
backtracetest.c
bounds.c	x86/asm: Remove ANNOTATE_DATA_SPECIAL usage	2025-12-03 16:53:19 +01:00
capability.c	capability: Remove unused has_capability	2025-03-07 22:03:09 -06:00
cfi.c	cfi: Move BPF CFI types and helpers to generic code	2025-07-31 18:23:53 -07:00
compat.c
configs.c
context_tracking.c	context_tracking: Make RCU watch ct_kernel_exit_state() warning	2025-03-04 18:44:29 -08:00
cpu.c	cpu: Make atomic hotplug callbacks run with interrupts disabled on UP	2025-12-10 15:49:11 +09:00
cpu_pm.c	syscore: Pass context data to callbacks	2025-11-14 10:01:52 +01:00
crash_core.c	kernel/crash: handle multi-page vmcoreinfo in crash kernel copy	2026-01-20 19:44:20 -08:00
crash_core_test.c	crash: add KUnit tests for crash_exclude_mem_range	2025-09-13 17:32:55 -07:00
crash_dump_dm_crypt.c	crash_dump: fix dm_crypt keys locking and ref leak	2026-01-31 16:16:08 -08:00
crash_reserve.c	crash: let architecture decide crash memory export to iomem_resource	2025-11-12 10:00:15 -08:00
cred.c	kernel-6.19-rc1.cred	2025-12-01 13:45:41 -08:00
delayacct.c	delayacct: add timestamp of delay max	2026-01-31 16:16:06 -08:00
dma.c
elfcorehdr.c
exec_domain.c
exit.c	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
exit.h
extable.c
fail_function.c
fork.c	kernel/fork: update obsolete use_mm references to kthread_use_mm	2026-01-26 19:07:12 -08:00
freezer.c	freezer: Clarify that only cgroup1 freezer uses PM freezer	2025-10-30 20:10:27 +01:00
gen_kheaders.sh	kheaders: make it possible to override TAR	2025-08-06 10:23:36 +09:00
groups.c
hung_task.c	hung_task: add hung_task_sys_info sysctl to dump sys info on task-hung	2025-11-20 14:03:43 -08:00
iomem.c	mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb()	2025-02-21 15:05:38 +01:00
irq_work.c	kasan: make kasan_record_aux_stack_noalloc() the default behaviour	2025-01-13 22:40:36 -08:00
jump_label.c	jump_label: Use RCU in all users of __module_text_address().	2025-03-10 11:54:46 +01:00
kallsyms.c	kallsyms: prevent module removal when printing module name and buildid	2026-01-20 19:44:23 -08:00
kallsyms_internal.h
kallsyms_selftest.c	kallsyms: use kmalloc_array() instead of kmalloc()	2025-09-28 11:36:14 -07:00
kallsyms_selftest.h
kcmp.c	kcmp: improve performance adding an unlikely hint to task comparisons	2025-02-21 10:25:33 +01:00
Kconfig.freezer
Kconfig.hz	kernel: Fix "select" wording on HZ_250 description	2025-02-21 09:20:30 +01:00
Kconfig.kexec	liveupdate: kho: move to kernel/liveupdate	2025-11-27 14:24:33 -08:00
Kconfig.locks
Kconfig.preempt	softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT	2025-09-17 16:25:41 +02:00
kcov.c	kcov: use write memory barrier after memcpy() in kcov_move_area()	2025-09-13 17:32:44 -07:00
kexec.c	kexec: enable CMA based contiguous allocation	2025-08-02 12:01:38 -07:00
kexec_core.c	kernel/kexec: fix IMA when allocation happens in CMA area	2025-12-23 11:23:14 -08:00
kexec_elf.c	kexec: initialize ELF lowest address to ULONG_MAX	2025-03-16 22:30:47 -07:00
kexec_file.c	kexec: derive purgatory entry from symbol	2026-01-31 16:16:07 -08:00
kexec_internal.h	kexec: enable CMA based contiguous allocation	2025-08-02 12:01:38 -07:00
kheaders.c
kprobes.c	kprobes: Add missing kerneldoc for __get_insn_slot	2025-07-15 18:45:34 +09:00
kstack_erase.c	sysctl: remove __user qualifier from stack_erasing_sysctl buffer argument	2025-11-27 15:44:53 +01:00
ksyms_common.c
ksysfs.c	kexec: move sysfs entries to /sys/kernel/kexec	2025-11-27 14:24:42 -08:00
kthread.c	kthread: Warn if mm_struct lacks user_ns in kthread_use_mm()	2025-12-24 21:32:58 +01:00
latencytop.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
Makefile	liveupdate: kho: move to kernel/liveupdate	2025-11-27 14:24:33 -08:00
module_signature.c
notifier.c
nscommon.c	ns: rename is_initial_namespace()	2025-11-11 10:01:31 +01:00
nsproxy.c	nsproxy: fix free_nsproxy() and simplify create_new_namespaces()	2025-11-14 13:10:38 +01:00
nstree.c	nstree: fix kernel-doc comments for internal functions	2025-11-14 13:10:38 +01:00
padata.c	padata: remove __padata_list_init()	2025-11-14 18:15:49 +08:00
panic.c	panic: add panic_force_cpu= parameter to redirect panic to a specific CPU	2026-02-03 08:21:26 -08:00
params.c	params: Replace deprecated strcpy() with strscpy() and memcpy()	2025-08-16 21:47:25 +02:00
pid.c	ns: drop custom reference count initialization for initial namespaces	2025-11-11 10:01:32 +01:00
pid_namespace.c	pid: rely on common reference count behavior	2025-11-11 10:01:32 +01:00
pid_sysctl.h	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
profile.c
ptrace.c	rseq: Introduce struct rseq_data	2025-11-04 08:30:50 +01:00
range.c
reboot.c	- The 7 patch series "powerpc/crash: use generic crashkernel	2025-04-01 10:06:52 -07:00
regset.c
relay.c	relay: update relay to use mmap_prepare	2025-11-16 17:28:11 -08:00
resource.c	Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()"	2025-11-27 14:24:45 -08:00
resource_kunit.c
rseq.c	rseq: Switch to fast path processing on exit to user	2025-11-04 08:34:39 +01:00
scftorture.c
scs.c	scs: fix a wrong parameter in __scs_magic	2025-11-12 10:00:13 -08:00
seccomp.c	Performance events updates for v6.18:	2025-09-30 11:11:21 -07:00
signal.c	signal: Move MMCID exit out of sighand lock	2025-11-25 19:45:40 +01:00
smp.c	smp: Introduce a helper function to check for pending IPIs	2025-11-19 18:06:50 +01:00
smpboot.c	sched/smp: Use the SMP version of idle_thread_set_boot_cpu()	2025-06-13 08:47:20 +02:00
smpboot.h
softirq.c	softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT	2025-09-17 16:25:41 +02:00
stacktrace.c
static_call.c
static_call_inline.c	Modules changes for 6.15-rc1	2025-03-30 15:44:36 -07:00
stop_machine.c	sched/core: Fix migrate_swap() vs. hotplug	2025-07-01 15:02:03 +02:00
sys.c	Patch series in this pull request:	2025-10-02 18:44:54 -07:00
sys_ni.c	uprobes/x86: Add uprobe syscall to speed up uprobe	2025-08-21 20:09:20 +02:00
sysctl-test.c	sysctl: move u8 register test to lib/test_sysctl.c	2025-04-14 14:13:41 +02:00
sysctl.c	sysctl: Wrap do_proc_douintvec with the public function proc_douintvec_conv	2025-11-27 15:45:38 +01:00
task_work.c	task_work: Fix NMI race condition	2025-10-29 10:29:54 +01:00
taskstats.c
torture.c	torture: Delay CPU-hotplug operations until boot completes	2025-08-14 15:26:30 -07:00
tracepoint.c	tracepoint: Print the function symbol when tracepoint_debug is set	2025-03-21 15:30:10 -04:00
tsacct.c	tsacct: skip all kernel threads	2026-01-26 19:07:13 -08:00
ucount.c	ucount: check for CAP_SYS_RESOURCE using ns_capable_noaudit()	2026-01-31 16:16:08 -08:00
uid16.c
uid16.h
umh.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
up.c
user-return-notifier.c
user.c	ns: drop custom reference count initialization for initial namespaces	2025-11-11 10:01:32 +01:00
user_namespace.c	ns: move ns type into struct ns_common	2025-09-25 09:23:54 +02:00
utsname.c	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
utsname_sysctl.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
vhost_task.c	vhost: Take a reference on the task in struct vhost_task.	2025-09-21 17:44:20 -04:00
vmcore_info.c	Merge branch 'mm-hotfixes-stable' into mm-nonmm-stable to pick up changes	2026-01-31 16:12:21 -08:00
watch_queue.c	watch_queue: Use local kmap in post_one_notification()	2025-11-19 12:17:28 +01:00
watchdog.c	watchdog: softlockup: panic when lockup duration exceeds N thresholds	2026-01-20 19:44:20 -08:00
watchdog_buddy.c	watchdog: fix opencoded cpumask_next_wrap() in watchdog_next_cpu()	2025-07-31 11:28:03 -04:00
watchdog_perf.c	watchdog: skip checks when panic is in progress	2025-09-13 17:32:53 -07:00
workqueue.c	workqueue: Don't rely on wq->rescuer to stop rescuer	2025-11-21 09:45:36 -10:00
workqueue_internal.h