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Subject[PATCH 01/15] x86 kdump: Extract kdump-specific code from crash_nmi_callback()
Date
The NMI CPU-halting code will be used on non-kdump cases, also
(e.g. emergency_reboot when virtualization is enabled).

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
arch/x86/kernel/crash.c | 31 ++++++++++++++++++++-----------
1 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 81e01f7..d82ac72 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -35,19 +35,34 @@ static int crashing_cpu;
#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
static atomic_t waiting_for_crash_ipi;

-static int crash_nmi_callback(struct notifier_block *self,
- unsigned long val, void *data)
+static void kdump_nmi_callback(int cpu, struct die_args *args)
{
struct pt_regs *regs;
#ifdef CONFIG_X86_32
struct pt_regs fixed_regs;
#endif
+
+ regs = args->regs;
+
+#ifdef CONFIG_X86_32
+ if (!user_mode_vm(regs)) {
+ crash_fixup_ss_esp(&fixed_regs, regs);
+ regs = &fixed_regs;
+ }
+#endif
+ crash_save_cpu(regs, cpu);
+
+ disable_local_APIC();
+}
+
+static int crash_nmi_callback(struct notifier_block *self,
+ unsigned long val, void *data)
+{
int cpu;

if (val != DIE_NMI_IPI)
return NOTIFY_OK;

- regs = ((struct die_args *)data)->regs;
cpu = raw_smp_processor_id();

/* Don't do anything if this handler is invoked on crashing cpu.
@@ -58,14 +73,8 @@ static int crash_nmi_callback(struct notifier_block *self,
return NOTIFY_STOP;
local_irq_disable();

-#ifdef CONFIG_X86_32
- if (!user_mode_vm(regs)) {
- crash_fixup_ss_esp(&fixed_regs, regs);
- regs = &fixed_regs;
- }
-#endif
- crash_save_cpu(regs, cpu);
- disable_local_APIC();
+ kdump_nmi_callback(cpu, (struct die_args *)data);
+
atomic_dec(&waiting_for_crash_ipi);
/* Assume hlt works */
halt();
--
1.5.5.GIT


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