This is a note to let you know that I've just added the patch titled
ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-7815-1-kexec-offline-non-panic-cpus-on-kdump-panic.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 4f9b4fb7a2091eec339413a460b1665758401828 Mon Sep 17 00:00:00 2001
From: Vijaya Kumar K <[email protected]>
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 <[email protected]>
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 <[email protected]>
Acked-by: Stephen Warren <[email protected]>
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Russell King <[email protected]>
Cc: l00221744 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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();
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/arm-7815-1-kexec-offline-non-panic-cpus-on-kdump-panic.patch
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