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SubjectRe: [Patch V0] x86, mce: Ensure offline CPU's don't participate in mce rendezvous process.
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@intel.com>
> Signed-off-by: Ashok Raj <ashok.raj@intel.com>
> ---
> 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>


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