io_uring/io-wq: return 2-step work swap scheme

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Saving one lock/unlock for io-wq is not super important, but adds some
ugliness in the code. More important, atomic decs not turning it to zero
for some archs won't give the right ordering/barriers so the
io_steal_work() may pretty easily get subtly and completely broken.

Return back 2-step io-wq work exchange and clean it up.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-02-04 13:52:08 +00:00 • committed by Jens Axboe

parent ea64ec02b3

commit 5280f7e530

3 changed files with 12 additions and 34 deletions

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16

fs/io-wq.c

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4

fs/io-wq.h

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26

fs/io_uring.c

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