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Subject: Re: [PATCH] powerpc: POWER7 optimised copy_to_user/copy_from_user
 using VMX
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anton Blanchard <anton@samba.org>
Date: Mon, 19 Dec 2011 14:19:07 +1100
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On Mon, 2011-12-19 at 14:00 +1100, Benjamin Herrenschmidt wrote:
> On Thu, 2011-12-08 at 17:11 +1100, Anton Blanchard wrote:
> > Implement a POWER7 optimised copy_to_user/copy_from_user using VMX.
> > For large aligned copies this new loop is over 10% faster, and for
> > large unaligned copies it is over 200% faster.
> 
> Breaks !CONFIG_ALTIVEC build an pops some WARN's with preempt & lockdep,
> this seems to fix them:

And it's missing another ifdef actually for !CONFIG_ALTIVEC, I'll fix it
locally and will put a fixed version in -next.

Cheers,
Ben.