| From 4f9b4fb7a2091eec339413a460b1665758401828 Mon Sep 17 00:00:00 2001 |
| From: Vijaya Kumar K <vijay.kilari@gmail.com> |
| Date: Wed, 14 Aug 2013 13:28:28 +0100 |
| Subject: ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic |
| |
| 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(); |