Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.10 01/23] ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic | Date | Thu, 23 Jan 2014 10:39:34 -0800 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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From: Vijaya Kumar K <vijay.kilari@gmail.com>
commit 4f9b4fb7a2091eec339413a460b1665758401828 upstream.
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> Cc: l00221744 <sdu.liu@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arm/kernel/machine_kexec.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/arm/kernel/machine_kexec.c +++ b/arch/arm/kernel/machine_kexec.c @@ -73,6 +73,7 @@ void machine_crash_nonpanic_core(void *u crash_save_cpu(®s, smp_processor_id()); flush_cache_all(); + set_cpu_online(smp_processor_id(), false); atomic_dec(&waiting_for_crash_ipi); while (1) cpu_relax();
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