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io_uring/msg_ring: flag target ring as having task_work, if needed

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Before the recent change, we didn't even wake the targeted task when
posting the cqe remotely. Now we do wake it, but we do want to ensure
that the recipient knows there's potential work there that needs to
get processed to get the CQE posted.

OR in IORING_SQ_TASKRUN for that purpose.

Link: https://lore.kernel.org/io-uring/2843c6b4-ba9a-b67d-e0f4-957f42098489@kernel.dk/
Fixes: 6d043ee116 ("io_uring: do msg_ring in target task via tw")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-12-08 09:36:02 -07:00
parent f66f73421f
commit 761c61c159
1 changed files with 1 additions and 0 deletions
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io_uring/msg_ring.c
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@ -67,6 +67,7 @@ static int io_msg_ring_data(struct io_kiocb *req)
TWA_SIGNAL_NO_IPI))
return -EOWNERDEAD;
atomic_or(IORING_SQ_TASKRUN, &target_ctx->rings->sq_flags);
return IOU_ISSUE_SKIP_COMPLETE;
}