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[for-next,v2,06/25] io_uring: explain io_wq_work::cancel_seq placement

Message ID 0a6cd1d420834f440928642df2c88a175d969cdb.1655213915.git.asml.silence@gmail.com (mailing list archive)
State New
Headers show
Series 5.20 cleanups and poll optimisations | expand

Commit Message

Pavel Begunkov June 14, 2022, 2:36 p.m. UTC 
Add a comment on why we keep ->cancel_seq in struct io_wq_work instead
of struct io_kiocb despite it needed only by io_uring but not io-wq.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/io-wq.h | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/io_uring/io-wq.h b/io_uring/io-wq.h
index ba6eee76d028..3f54ee2a8eeb 100644
--- a/io_uring/io-wq.h
+++ b/io_uring/io-wq.h
@@ -155,6 +155,7 @@  struct io_wq_work_node *wq_stack_extract(struct io_wq_work_node *stack)
 struct io_wq_work {
 	struct io_wq_work_node list;
 	unsigned flags;
+	/* place it here instead of io_kiocb as it fills padding and saves 4B */
 	int cancel_seq;
 };