Re: [PATCH] bitops: add _local bitops

From: Michael S. Tsirkin
Date: Wed May 09 2012 - 16:12:39 EST

On Wed, May 09, 2012 at 01:10:04PM -0700, H. Peter Anvin wrote:
> On 05/09/2012 01:07 PM, Michael S. Tsirkin wrote:
> >
> > In practice ATM any of the above will work. We probably don't even need
> > to add barrier() calls since what we do afterwards is apic access which
> > has an optimization barrier anyway. But I'm fine with adding them in
> > there just in case if that's what people want.
> >
> If you have the optimization barrier anyway, then I'd be fine with you
> just using __test_and_clear_bit() and add to a comment in
> arch/x86/include/asm/bitops.h that KVM needs it to be locally atomic.
> -hpa

Sounds good. Avi?
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