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io_uring: don't save/restore iowait state
[ Upstream commit 6f0974eccbf78baead1735722c4f1ee3eb9422cd ] This kind of state is per-syscall, and since we're doing the waiting off entering the io_uring_enter(2) syscall, there's no way that iowait can already be set for this case. Simplify it by setting it if we need to, and always clearing it to 0 when done. Fixes: 7b72d66 ("io_uring: gate iowait schedule on having pending requests") Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>
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