On Mon, Sep 05, 2016 at 11:56:05AM +0100, Will Deacon wrote: > 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@xxxxxxxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Reported-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Signed-off-by: Will Deacon <will.deacon@xxxxxxx> Queued for -rc6. Thanks. -- Catalin -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html