* tip-bot for Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote: > Commit-ID: e87aaa7b6d80474ec07a2d2be3f50ef574ffe36c > Gitweb: http://git.kernel.org/tip/e87aaa7b6d80474ec07a2d2be3f50ef574ffe36c > Author: Arjan van de Ven <arjan@xxxxxxxxxxxxx> > AuthorDate: Wed, 30 Sep 2009 17:07:54 +0200 > Committer: Ingo Molnar <mingo@xxxxxxx> > CommitDate: Wed, 30 Sep 2009 22:35:44 +0200 > > x86: Provide an alternative() based cmpxchg64() > > cmpxchg64() today generates, to quote Linus, "barf bag" code. > > cmpxchg64() is about to get used in the scheduler to a bug there, > but it's a prerequisite that cmpxchg64() first be made non-sucking. > > This patch turns cmpxchg64() into an efficient implementation that > uses the alternative() mechanism to just use the raw instruction on > all modern systens The changelog above has 3 typos so i fixed that. The push will generate the hopefully-final version of these patches. Note, i slightly updated Linus's version of the old-CPU emu code with Eric's micro-optimization. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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