Question reg. asm/qrwlock.h

[Pranith Kumar]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/