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    SubjectRe: [PATCH, RFC] [1/3] Generic in-kernel AC status
    On St 08-02-06 23:25:32, Philipp Matthias Hahn wrote:
    > Hi!
    >
    > On Wed, Feb 08, 2006 at 01:04:22PM +0000, Matthew Garrett wrote:
    > > diff --git a/include/linux/pm.h b/include/linux/pm.h
    > ...
    > > +void pm_set_ac_status(int (*ac_status_function)(void))
    > > +{
    > > + down(&pm_sem);
    > > + get_ac_status = ac_status_function;
    > > + up(&pm_sem);
    > > +}
    >
    > Why do you need a semaphore/mutex, when you only do one assignment,
    > which is atomic by itself?

    It is not.
    Pavel

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