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    SubjectRe: [PATCH] futex: cmpxchg_futex_value_locked API change
    Date
    Michel Lespinasse <walken@google.com> wrote:

    > The cmpxchg_futex_value_locked API was funny in that it returned either
    > the original, user-exposed futex value OR an error code such as -EFAULT.
    > This was confusing at best, and could be a source of livelocks in places
    > that retry the cmpxchg_futex_value_locked after trying to fix the issue
    > by running fault_in_user_writeable().
    >
    > This change makes the cmpxchg_futex_value_locked API more similar to the
    > get_futex_value_locked one, returning an error code and updating the
    > original value through a reference argument.
    >
    > Signed-off-by: Michel Lespinasse <walken@google.com>

    Acked-by: David Howells <dhowells@redhat.com> [FRV]


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