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| author | Uros Bizjak <ubizjak@gmail.com> | 2023-02-27 22:42:28 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-03-28 16:20:09 -0700 |
| commit | bdeb91881088810ab1d8ae620862c3b4d78f4041 (patch) | |
| tree | b5790da422d9eb9b58e4d08905ffb3ef84b60377 /lib/Kconfig.kgdb | |
| parent | f2421a16f42a2f121c587c89b60cc8f3f2df36c2 (diff) | |
| download | lwn-bdeb91881088810ab1d8ae620862c3b4d78f4041.tar.gz lwn-bdeb91881088810ab1d8ae620862c3b4d78f4041.zip | |
mm/rmap: use atomic_try_cmpxchg in set_tlb_ubc_flush_pending
Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old
in set_tlb_ubc_flush_pending. 86 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.
No functional change intended.
Link: https://lkml.kernel.org/r/20230227214228.3533299-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib/Kconfig.kgdb')
0 files changed, 0 insertions, 0 deletions