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| author | Uros Bizjak | 2022-07-14 18:33:01 +0200 |
|---|---|---|
| committer | Jens Axboe | 2022-07-24 18:39:18 -0600 |
| commit | 4ccc6db0900fe337212b61650663a5dcedb69f25 (patch) | |
| tree | 48c46809c46a9461f9f33c3b1e12f6602fa168ba /mm/swap.h | |
| parent | 9bb66906f23e50d6db1e11f7498b72dfca1982a2 (diff) | |
io_uring: Use atomic_long_try_cmpxchg in __io_account_mem
Use atomic_long_try_cmpxchg instead of
atomic_long_cmpxchg (*ptr, old, new) == old in __io_account_mem.
x86 CMPXCHG instruction returns success in ZF flag, so this
change saves a compare after cmpxchg (and related move
instruction in front of cmpxchg).
Also, atomic_long_try_cmpxchg implicitly assigns old *ptr value
to "old" when cmpxchg fails, enabling further code simplifications.
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'mm/swap.h')
0 files changed, 0 insertions, 0 deletions