On Thu, Dec 03, 2015 at 07:16:10PM -0500, Ashok Raj wrote: > Linux has logical cpu offline capability. That can be triggered by: > > # echo 0 > /sys/devices/system/cpu/cpuX/online > > In Intel Architecture, MCE's are broadcasted to all CPUs in the system. > > This includes the CPUs marked offline by Linux. Unless the CPU's were removed > via an ACPI notification, in which case the cpu's are removed from the > cpu_present_map. > > This patch ensures offline CPU's don't participate in MCE rendezvous, but > simply perform clearing some status bits to ensure a second MCE wont cause > automatic shutdown. > > Without the patch, mce_start will increment mce_callin, but mce_start would > wait for all online_cpus. So offline cpu's should avoid participating in the > rendezvous process. > > Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx> > Signed-off-by: Ashok Raj <ashok.raj@xxxxxxxxx> > --- > arch/x86/kernel/cpu/mcheck/mce.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > <formletter> This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read Documentation/stable_kernel_rules.txt for how to do this properly. </formletter> -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html