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io_uring: optimise INIT_WQ_LIST 

The invariant of io_wq_work_list is that it's empty IFF ->first is NULL,
so no need to initially set ->last. With now having more users of the
list it may play a role, i.e. used in each tw iteration and on every
completion flushing.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c464ab5cab6e46a858c6d39c107e92b3b5291f13.1633373302.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-04 20:02:50 +01:00 committed by Jens Axboe
parent a33ae9ce16
commit 765ff496c7
1 changed files with 0 additions and 1 deletions
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fs/io-wq.h
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@ -38,7 +38,6 @@ struct io_wq_work_list {
#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
#define INIT_WQ_LIST(list) do { \
(list)->first = NULL; \
(list)->last = NULL; \
} while (0)
static inline void wq_list_add_after(struct io_wq_work_node *node,