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    SubjectRe: [PATCH] lockdep: change scheduler annotation
    From: Peter Zijlstra <>
    Date: Wed, 30 Jul 2008 13:26:57 +0200

    > While thinking about David's patch it _finally_ dawned on me that there
    > is no reason we have a lock class per cpu..
    > Sorry for being dense :-/
    > The below changes the annotation from a lock class per cpu, to a single
    > nested lock, as the scheduler never holds more that 2 rq locks at a time
    > anyway.
    > If there was code requiring holding all rq locks this would not work and
    > the original annotation would be the only option, but that not being the
    > case, this is a much lighter one.
    > Compiles and boots on a 2-way x86_64.
    > Signed-off-by: Peter Zijlstra <>

    I had been wondering this entire debugging session why the
    per-rq lock classes were even there, thanks for getting
    rid of them :)

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