Hi, On 1/12/2023 12:06 AM, David Howells wrote: > Hou Tao <hou...@huaweicloud.com> wrote: > >> clear_bit(FSCACHE_VOLUME_ACQUIRE_PENDING, >> &cursor->flags); >> + /* >> + * Paired with barrier in wait_on_bit(). Check >> + * wake_up_bit() and waitqueue_active() for details. >> + */ >> + smp_mb__after_atomic(); >> wake_up_bit(&cursor->flags, >> FSCACHE_VOLUME_ACQUIRE_PENDING); > What two values are you applying a partial ordering to? cursor->flags and wq->head. fscache_wake_pending_volume() will write cursor->flags and read wq->head through waitqueue_active(), and the wait will write wq->head then read cursor->flags. > > David >
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