[PATCH 4.8 040/138] powerpc/64: Fix race condition in setting lock bit in idle/wakeup code

4.8-stable review patch. If anyone has any objections, please let me know. -- From: Paul Mackerras commit 09b7e37b18eecc1e347f4b1a3bc863f32801f634 upstream. This fixes a race condition where one thread that is entering or leaving a power-saving state can

[PATCH 4.8 040/138] powerpc/64: Fix race condition in setting lock bit in idle/wakeup code

4.8-stable review patch. If anyone has any objections, please let me know. -- From: Paul Mackerras commit 09b7e37b18eecc1e347f4b1a3bc863f32801f634 upstream. This fixes a race condition where one thread that is entering or leaving a power-saving state can inadvertently ignore