Hi Waiman,
I see that in arch/x86/include/asm/qrwlock.h, there is this snippet within
#ifndef CONFIG_X86_PPRO_FENCE
#define queue_write_unlock queue_write_unlock
static inline void queue_write_unlock(struct qrwlock *lock)
{
barrier();
ACCESS_ONCE(*(u8 *)&lock->cnts) = 0;
}
#endif
I've been trying to understand why this special case is necessary for
PPRO. Could you please explain?
Thanks!
--
Pranith
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