On Wed, 2012-05-09 at 13:10 -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. > > What is it used for ? IE. Is this strictly a requirement of x86 KVM ? Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
