On Fri, Jun 09, 2017 at 01:36:08AM +1000, Nicholas Piggin wrote:
> The hwsync in the context switch code to prevent MMIO access being
> reordered from the point of view of a single process if it gets
> migrated to a different CPU is not required because there is an hwsync
> performed earlier in the context switch path.
> 
> Comment this so it's clear enough if anything changes on the scheduler
> or the powerpc sides. Remove the hwsync from _switch.
> 
> This improves context switch performance by 2-3% on POWER8.
> 
> Cc: Peter Zijlstra <pet...@infradead.org>
> Signed-off-by: Nicholas Piggin <npig...@gmail.com>

Acked-by: Peter Zijlstra (Intel) <pet...@infradead.org>

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