diff options
Diffstat (limited to 'kernel/panic.c')
| -rw-r--r-- | kernel/panic.c | 47 |
1 files changed, 40 insertions, 7 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index ca8cea1ef673..e6480e20379e 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -71,6 +71,32 @@ void __weak nmi_panic_self_stop(struct pt_regs *regs) panic_smp_self_stop(); } +/* + * Stop other CPUs in panic. Architecture dependent code may override this + * with more suitable version. For example, if the architecture supports + * crash dump, it should save registers of each stopped CPU and disable + * per-CPU features such as virtualization extensions. + */ +void __weak crash_smp_send_stop(void) +{ + static int cpus_stopped; + + /* + * This function can be called twice in panic path, but obviously + * we execute this only once. + */ + if (cpus_stopped) + return; + + /* + * Note smp_send_stop is the usual smp shutdown function, which + * unfortunately means it may not be hardened to work in a panic + * situation. + */ + smp_send_stop(); + cpus_stopped = 1; +} + atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID); /* @@ -164,14 +190,21 @@ void panic(const char *fmt, ...) if (!_crash_kexec_post_notifiers) { printk_nmi_flush_on_panic(); __crash_kexec(NULL); - } - /* - * Note smp_send_stop is the usual smp shutdown function, which - * unfortunately means it may not be hardened to work in a panic - * situation. - */ - smp_send_stop(); + /* + * Note smp_send_stop is the usual smp shutdown function, which + * unfortunately means it may not be hardened to work in a + * panic situation. + */ + smp_send_stop(); + } else { + /* + * If we want to do crash dump after notifier calls and + * kmsg_dump, we will need architecture dependent extra + * works in addition to stopping other CPUs. + */ + crash_smp_send_stop(); + } /* * Run any panic handlers, including those that might need to |