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    SubjectRe: [tip:sched/urgent] x86: Provide an alternative() based cmpxchg64()

    * tip-bot for Arjan van de Ven <arjan@infradead.org> wrote:

    > Commit-ID: e87aaa7b6d80474ec07a2d2be3f50ef574ffe36c
    > Gitweb: http://git.kernel.org/tip/e87aaa7b6d80474ec07a2d2be3f50ef574ffe36c
    > Author: Arjan van de Ven <arjan@infradead.org>
    > AuthorDate: Wed, 30 Sep 2009 17:07:54 +0200
    > Committer: Ingo Molnar <mingo@elte.hu>
    > 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


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