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Commit 249ec228 authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
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powerpc/kdump: Stop all other CPUs before running crash handlers 



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: default avatarAnton Blanchard <anton@samba.org>
Acked-by: default avatarMatt Evans <matt@ozlabs.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 34692708

arch/powerpc/kernel/crash.c

+13 −11
Original line number Diff line number Diff line
@@ -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);

}