From: Vijaya Kumar K Date: Wed, 14 Aug 2013 12:28:28 +0000 (+0100) Subject: ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic X-Git-Tag: firefly_0821_release~3679^2~3058 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=36a2e5010fe877bc2f049682d3b9ede4357a3927;p=firefly-linux-kernel-4.4.55.git ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic 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 Acked-by: Stephen Warren Acked-by: Will Deacon Signed-off-by: Russell King Cc: l00221744 Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c index 4fb074c446bf..163b160c69e9 100644 --- a/arch/arm/kernel/machine_kexec.c +++ b/arch/arm/kernel/machine_kexec.c @@ -73,6 +73,7 @@ void machine_crash_nonpanic_core(void *unused) 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();