diff options
| author | Uros Bizjak <[email protected]> | 2024-05-23 11:19:26 +0200 |
|---|---|---|
| committer | Kent Overstreet <[email protected]> | 2024-07-14 19:00:12 -0400 |
| commit | 68573b936d3fceda9cd5cce3a577e035d19ad426 (patch) | |
| tree | 872f291bf9b8d6f439c9d0a5bd372d42557e8e6b /tools/perf/scripts/python | |
| parent | e76a2b65b0565f55ea668ec46d54f6a00b8ea9fc (diff) | |
bcachefs: Use try_cmpxchg() family of functions instead of cmpxchg()
Use try_cmpxchg() family of functions instead of
cmpxchg (*ptr, old, new) == old. 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, try_cmpxchg() implicitly assigns old *ptr value to "old" when
cmpxchg fails. There is no need to re-read the value in the loop.
No functional change intended.
Signed-off-by: Uros Bizjak <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: Brian Foster <[email protected]>
Signed-off-by: Kent Overstreet <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions