On Wed, 9 May 2012, 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. > > Add _local bitops for this purpose: define them > as non-atomics for x86 and (for now) atomics for > everyone else. Have you tried to use the this_cpu_ops for that purpose? They create the per cpu atomic instructions that you want without a lock prefix and can also relocate the per cpu pointer to the correct processor via a segment register prefix. There are no bit operations provided right now but those can either be improvised using this_cpu_cmpxchg or added. -- 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
