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    SubjectRe: [PATCH v3 2/2] locking/percpu-rwsem: Annotate rwsem ownership transfer by setting RWSEM_OWNER_UNKNOWN
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    On 05/15/2018 01:58 PM, Peter Zijlstra wrote:
    > On Tue, May 15, 2018 at 01:38:04PM -0400, Waiman Long wrote:
    >> +/*
    >> + * Owner value to indicate the rwsem's owner is not currently known.
    >> + */
    >> +#define RWSEM_OWNER_UNKNOWN ((struct task_struct *)-1)
    > It might be nice to comment that this works and relies on having that
    > ANON_OWNER bit set.

    I am just trying not to expose internal working of rwsem, but I can
    document that one of the bits is the real deal without specifying which one.

    Cheers,
    Longman

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