For smp, barriers are required when a mutex lock is acquired or released. Mutex slowpath routines already contain the necessary barriers. Change-Id: I774fc6e7bd5b1db9a0f51dee456b71c569cd512e Signed-off-by: Brent DeGraaf <bdegraaf@codeaurora.org> (cherry picked from commit 62c6b43d05a6aab278eb7d5d0030bd731b7684ea)