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| author | Uros Bizjak <ubizjak@gmail.com> | 2022-07-14 18:48:51 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-11 21:55:08 -0700 |
| commit | 38ace0d513d9d2556beca4d07102d25e9a73c53c (patch) | |
| tree | bf83fbde66aefcfb6b20fc16f1491fa3d32e62ff /security | |
| parent | b0192296b45232872720d969366449c001ab1f4a (diff) | |
| download | linux-38ace0d513d9d2556beca4d07102d25e9a73c53c.tar.bz2 | |
aio: use atomic_try_cmpxchg in __get_reqs_available
Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old
in __get_reqs_available. 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_try_cmpxchg implicitly assigns old *ptr value to "old" when
cmpxchg fails, enabling further code simplifications.
No functional change intended.
Link: https://lkml.kernel.org/r/20220714164851.3055-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions