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SubjectRe: [patch] x86: avoid unnecessary smp alternatives switch during suspend/resume
On Fri, Nov 19, 2010 at 04:09:24PM -0800, Suresh Siddha wrote:
>During suspend, we disable all the non boot cpus. And during resume we bring
>them all back again. So no need to do alternatives_smp_switch() in between.
>This speeds up both suspend and resume paths.
>Signed-off-by: Suresh Siddha <>

This is a cool idea!

The patch looks good for me, just note that kexec
also calls disable_nonboot_cpus(), so the name 'pm_sleep_smp'
is a bit confused. ;)

Reviewed-by: WANG Cong <>


Live like a child, think like the god.

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