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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-22 17:09:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-22 17:09:14 -0700 |
| commit | a24e3d414e59ac76566dedcad1ed1d319a93ec14 (patch) | |
| tree | a14aedc216dd4eb1633c7510b4b5dc2c61cc936b /kernel/panic.c | |
| parent | b91d9c6716319dcd9e6ffcfc9defaf79e705daab (diff) | |
| parent | 8fe9752ef10343a8edb603cb93abc2bfae34e748 (diff) | |
Merge branch 'akpm' (patches from Andrew)
Merge third patch-bomb from Andrew Morton:
- more ocfs2 changes
- a few hotfixes
- Andy's compat cleanups
- misc fixes to fatfs, ptrace, coredump, cpumask, creds, eventfd,
panic, ipmi, kgdb, profile, kfifo, ubsan, etc.
- many rapidio updates: fixes, new drivers.
- kcov: kernel code coverage feature. Like gcov, but not
"prohibitively expensive".
- extable code consolidation for various archs
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (81 commits)
ia64/extable: use generic search and sort routines
x86/extable: use generic search and sort routines
s390/extable: use generic search and sort routines
alpha/extable: use generic search and sort routines
kernel/...: convert pr_warning to pr_warn
drivers: dma-coherent: use memset_io for DMA_MEMORY_IO mappings
drivers: dma-coherent: use MEMREMAP_WC for DMA_MEMORY_MAP
memremap: add MEMREMAP_WC flag
memremap: don't modify flags
kernel/signal.c: add compile-time check for __ARCH_SI_PREAMBLE_SIZE
mm/mprotect.c: don't imply PROT_EXEC on non-exec fs
ipc/sem: make semctl setting sempid consistent
ubsan: fix tree-wide -Wmaybe-uninitialized false positives
kfifo: fix sparse complaints
scripts/gdb: account for changes in module data structure
scripts/gdb: add cmdline reader command
scripts/gdb: add version command
kernel: add kcov code coverage
profile: hide unused functions when !CONFIG_PROC_FS
hpwdt: use nmi_panic() when kernel panics in NMI handler
...
Diffstat (limited to 'kernel/panic.c')
| -rw-r--r-- | kernel/panic.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index fa400852bf6c..535c96510a44 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -73,6 +73,26 @@ void __weak nmi_panic_self_stop(struct pt_regs *regs) atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID); +/* + * A variant of panic() called from NMI context. We return if we've already + * panicked on this CPU. If another CPU already panicked, loop in + * nmi_panic_self_stop() which can provide architecture dependent code such + * as saving register state for crash dump. + */ +void nmi_panic(struct pt_regs *regs, const char *msg) +{ + int old_cpu, cpu; + + cpu = raw_smp_processor_id(); + old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, cpu); + + if (old_cpu == PANIC_CPU_INVALID) + panic("%s", msg); + else if (old_cpu != cpu) + nmi_panic_self_stop(regs); +} +EXPORT_SYMBOL(nmi_panic); + /** * panic - halt the system * @fmt: The text string to print |