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MIPS: kdump: Mark cpu back online before rebooting 

The crash utility initializes cpu state by reading the system kernel
memory, which is copied into vmcore.

It is also natural to preserve the online state for CPUs at crash.

Failing to do so could make the analysis tool present info for only 1 CPU
by default, and unable to find panic task.

Signed-off-by: Dengcheng Zhu <dzhu@wavecomp.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20809/
Cc: Paul Burton <pburton@wavecomp.com>
Cc: "ralf@linux-mips.org" <ralf@linux-mips.org>
Cc: "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>
Cc: "rachel.mozes@intel.com" <rachel.mozes@intel.com>
This commit is contained in:
Dengcheng Zhu 2018-09-26 19:49:10 +00:00 committed by Paul Burton
parent edaa978e52
commit 82689ac663
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1 changed files with 10 additions and 0 deletions
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10
arch/mips/kernel/machine_kexec.c
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@ -173,6 +173,16 @@ void kexec_reboot(void)
{
void (*do_kexec)(void) __noreturn;
/*
* We know we were online, and there will be no incoming IPIs at
* this point. Mark online again before rebooting so that the crash
* analysis tool will see us correctly.
*/
set_cpu_online(smp_processor_id(), true);
/* Ensure remote CPUs observe that we're online before rebooting. */
smp_mb__after_atomic();
#ifdef CONFIG_SMP
if (smp_processor_id() > 0) {
/*