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Diffstat (limited to 'arch/powerpc/kernel/crash.c')
-rw-r--r--arch/powerpc/kernel/crash.c16
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();