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Now that cmwq can handle high concurrency, it's more efficient to use work than a dedicated kthread. Convert p9_poll_proc() to a work function for p9_poll_work and make p9_pollwake() schedule it on each poll event. The work is sync flushed on module exit. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Cc: v9fs-developer@lists.sourceforge.net