Re: [PATCH] bitops: add _local bitops

From: H. Peter Anvin
Date: Wed May 09 2012 - 16:10:24 EST

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.

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