Re: Linux 2.6.32-rc1

Linus Torvalds
2009-09-30T17:10:24Z

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