Will Deacon 872c63fbf9 arm64: spinlocks: implement smp_mb__before_spinlock() as smp_mb() ... smp_mb__before_spinlock() is intended to upgrade a spin_lock() operation to a full barrier, such that prior stores are ordered with respect to loads and stores occuring inside the critical section. Unfortunately, the core code defines the barrier as smp_wmb(), which is insufficient to provide the required ordering guarantees when used in conjunction with our load-acquire-based spinlock implementation. This patch overrides the arm64 definition of smp_mb__before_spinlock() to map to a full smp_mb(). Cc: <stable@vger.kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Reported-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2016-09-09 12:33:48 +01:00
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asm	arm64: spinlocks: implement smp_mb__before_spinlock() as smp_mb()	2016-09-09 12:33:48 +01:00
uapi/asm	arm64 fixes:	2016-08-06 08:58:59 -04:00