On Mon, Feb 10, 2014 at 06:17:12PM +0100, Nicholas Mc Guire wrote: > maybe I'm missing/missunderstanding something here but > pi_unlock -> arch_spin_unlock is a full mb() Nope, arch_spin_unlock() on x86 is a single add[wb] without LOCK prefix. The lock and unlock primitives are in general specified to have ACQUIRE resp. RELEASE semantics. See Documentation/memory-barriers.txt for far too much head-hurting details. -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
