From: Linus Torvalds <[email protected]>
Date: Sat, 15 Oct 2005 09:57:47 -0700 (PDT)
> On Sat, 15 Oct 2005, Herbert Xu wrote:
> >
> > Yes atomic_add_negative should always be a barrier.
>
> I disagree. That would be very expensive on anything but x86, where it
> just happens to be true for other reasons. Atomics do _not_ implement
> barriers.
When they return values, they are defined to be barriers.
It's even on the documentation :-)
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