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ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic

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In case of normal kexec kernel load, all cpu's are offlined
before calling machine_kexec().But in case crash panic cpus
are relaxed in machine_crash_nonpanic_core() SMP function
but not offlined.

When crash kernel is loaded with kexec and on panic trigger
machine_kexec() checks for number of cpus online.
If more than one cpu is online machine_kexec() fails to load
with below error

kexec: error: multiple CPUs still online

In machine_crash_nonpanic_core() SMP function, offline CPU
before cpu_relax

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Vijaya Kumar K 2013-08-14 13:28:28 +01:00 committed by Russell King
parent 2a2822475d
commit 4f9b4fb7a2
1 changed files with 1 additions and 0 deletions
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arch/arm/kernel/machine_kexec.c
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@ -82,6 +82,7 @@ void machine_crash_nonpanic_core(void *unused)
crash_save_cpu(&regs, smp_processor_id()); crash_save_cpu(&regs, smp_processor_id());
flush_cache_all(); flush_cache_all();
set_cpu_online(smp_processor_id(), false);
atomic_dec(&waiting_for_crash_ipi); atomic_dec(&waiting_for_crash_ipi);
while (1) while (1)
cpu_relax(); cpu_relax();