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powerpc/kdump: Stop all other CPUs before running crash handlers

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During kdump we run the crash handlers first then stop all other CPUs.
We really want to stop all CPUs as close to the fail as possible and also
have a very controlled environment for running the crash handlers, so it
makes sense to reverse the order.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-08-02 20:39:41 +00:00 committed by Benjamin Herrenschmidt
parent 3469270807
commit 249ec22875
1 changed files with 13 additions and 11 deletions
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24
arch/powerpc/kernel/crash.c
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@ -402,6 +402,18 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
*/
hard_irq_disable();
/*
* Make a note of crashing cpu. Will be used in machine_kexec
* such that another IPI will not be sent.
*/
crashing_cpu = smp_processor_id();
crash_save_cpu(regs, crashing_cpu);
crash_kexec_prepare_cpus(crashing_cpu);
cpu_set(crashing_cpu, cpus_in_crash);
#if defined(CONFIG_PPC_STD_MMU_64) && defined(CONFIG_SMP)
crash_kexec_wait_realmode(crashing_cpu);
#endif
for_each_irq(i) {
struct irq_desc *desc = irq_to_desc(i);
@ -438,18 +450,8 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
crash_shutdown_cpu = -1;
__debugger_fault_handler = old_handler;
/*
* Make a note of crashing cpu. Will be used in machine_kexec
* such that another IPI will not be sent.
*/
crashing_cpu = smp_processor_id();
crash_save_cpu(regs, crashing_cpu);
crash_kexec_prepare_cpus(crashing_cpu);
cpu_set(crashing_cpu, cpus_in_crash);
crash_kexec_stop_spus();
#if defined(CONFIG_PPC_STD_MMU_64) && defined(CONFIG_SMP)
crash_kexec_wait_realmode(crashing_cpu);
#endif
if (ppc_md.kexec_cpu_down)
ppc_md.kexec_cpu_down(1, 0);
}