On Fri, 2015-07-17 at 10:32 +0100, Will Deacon wrote:
> static inline void arch_spin_unlock(arch_spinlock_t *lock)
> {
> - SYNC_IO;
> - __asm__ __volatile__("# arch_spin_unlock\n\t"
> - PPC_RELEASE_BARRIER: : :"memory");
> + smp_mb();
> lock->slock = 0;
> }
That probably needs to be mb() in case somebody has the expectation that
it does a barrier vs. DMA on UP.
Cheers,
Ben.
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