On 05/09/2012 06:45 AM, Michael S. Tsirkin wrote: > kvm needs to update some hypervisor variables atomically > in a sense that the operation can't be interrupted > in the middle. However the hypervisor always runs > on the same CPU so it does not need any memory > barrier or lock prefix. > > At Peter Anvin's suggestion, add _local bitops for this purpose: > define them as non-atomics for x86 and (for now) atomics > for everyone else. > > Uses are not restricted to virtualization: they > might be useful to communicate with an interrupt > handler if we know that it's running on the same CPU. > > Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx> I don't think you can use the x86 nonatomics as-is, because they don't contain optimization barriers. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
