| Date | Wed, 30 Sep 2009 10:08:53 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: Linux 2.6.32-rc1 |
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On Wed, 30 Sep 2009, Stefan Richter wrote: > > As long as it can't be turned into an atomic access, shouldn't cmpxchg64 > be hidden from the common kernel coder? Almost everybody will assume > that it is an atomic operation and happily use it in unsafe places.
But it _is_ atomic. We don't support SMP on the platforms that we have to do it with emulation on.
There's a theoretical problem with NMI, but it's not one we can solve or that is really all that interesting, so might as well ignore it.
Linus
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