x86: Add memory modify constraints to xchg() and cmpxchg()
in [Kernel]
|
Prev: Regression 2.6.35-rc6: ALSA Intel HDA/Realtek: missing Beep
Next: mmotm 2010-07-27-14-56 uploaded (staging/iio)
From: Linus Torvalds on 28 Jul 2010 11:50 On Tue, Jul 27, 2010 at 10:33 PM, tip-bot for H. Peter Anvin <hpa(a)zytor.com> wrote: > > x86: Add memory modify constraints to xchg() and cmpxchg() Ack. I assume this doesn't really change the code generated? At least not with a gcc that honors the whole memory clobber thing properly? I also suspect that we can/should get rid of the __xg() thing - it was there just to make sure gcc didn't see the memory read as a single word and tried to optimize it. With the "+m" it probably doesn't matter any more (don't know if it ever did) Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |