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    SubjectRe: [PATCH 7/8] percpu: add __percpu sparse annotations to hw_breakpoint
    On 01/25/2010 04:19 PM, Frederic Weisbecker wrote:
    > On Tue, Jan 26, 2010 at 12:22:14AM +0900, Tejun Heo wrote:
    >> Add __percpu sparse annotations to hw_breakpoint.
    >>
    >> These annotations are to make sparse consider percpu variables to be
    >> in a different address space and warn if accessed without going
    >> through percpu accessors. This patch doesn't affect normal builds.
    >>
    >> per_cpu(nr_task_bp_pinned, cpu) is replaced with
    >> &per_cpu(nr_task_bp_pinned[0], cpu). This is the same to the compiler
    >> but allows per_cpu() macro to correctly drop __percpu designation for
    >> the returned pointer.
    >
    > Ouch... It's unpleasant to see such workaround that messes up the
    > code just to make sparse happy.
    >
    > I guess __percpu is an address_space attribute? Is there no
    > way to force the address space change directly from the
    > per_cpu() macro?
    >

    Hmm... thinking more about it, we should be able to just move the & and
    [0] into the per_cpu() macro, addressing the situation, or does that
    cause problems elsewhere?

    -hpa


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