diff options
Diffstat (limited to 'arch/powerpc/kernel/crash.c')
| -rw-r--r-- | arch/powerpc/kernel/crash.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c index cbabb5adccd9..00b215125d3e 100644 --- a/arch/powerpc/kernel/crash.c +++ b/arch/powerpc/kernel/crash.c @@ -44,6 +44,14 @@ #define REAL_MODE_TIMEOUT 10000 static int time_to_dump; +/* + * crash_wake_offline should be set to 1 by platforms that intend to wake + * up offline cpus prior to jumping to a kdump kernel. Currently powernv + * sets it to 1, since we want to avoid things from happening when an + * offline CPU wakes up due to something like an HMI (malfunction error), + * which propagates to all threads. + */ +int crash_wake_offline; #define CRASH_HANDLER_MAX 3 /* List of shutdown handles */ @@ -63,15 +71,12 @@ static int handle_fault(struct pt_regs *regs) #ifdef CONFIG_SMP static atomic_t cpus_in_crash; -static void crash_ipi_callback(struct pt_regs *regs) +void crash_ipi_callback(struct pt_regs *regs) { static cpumask_t cpus_state_saved = CPU_MASK_NONE; int cpu = smp_processor_id(); - if (!cpu_online(cpu)) - return; - hard_irq_disable(); if (!cpumask_test_cpu(cpu, &cpus_state_saved)) { crash_save_cpu(regs, cpu); @@ -109,6 +114,9 @@ static void crash_kexec_prepare_cpus(int cpu) printk(KERN_EMERG "Sending IPI to other CPUs\n"); + if (crash_wake_offline) + ncpus = num_present_cpus() - 1; + crash_send_ipi(crash_ipi_callback); smp_wmb(); |