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x86 kdump: extract kdump-specific code from crash_nmi_callback()

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Impact: cleanup

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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Eduardo Habkost 2008-11-12 11:34:37 -02:00 committed by Ingo Molnar
parent eb42c75878
commit a7d41820f6
1 changed files with 20 additions and 11 deletions
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31
arch/x86/kernel/crash.c
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@ -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();