Re: [PATCH] x86/smpboot: check if CLFLUSH is actually necessary

From: H. Peter Anvin
Date: Wed Feb 11 2015 - 16:56:30 EST

On 01/30/2015 01:26 PM, Scotty Bauer wrote:
> mwait_play_dead previously issued a CLFLUSH to work around a bug on
> some xeon processors. We can now determine if the CPU is a buggy CPU.
> This patch checks if if we're on a buggy CPU which allows non-buggy
> cpu's to eliminate the CLFLUSH.

Here is my first question: does this matter at all? Otherwise I don't
see a point.


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