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| author | Uros Bizjak <ubizjak@gmail.com> | 2024-01-24 11:58:16 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2024-03-01 12:54:25 +0100 |
| commit | e807c2a37044a51de89d6d4f8a1f5ecfb3752f36 (patch) | |
| tree | 6bbce6951a8ff33b095fea22a79f6f9dc762b555 /kernel/locking | |
| parent | f3e3620f1a97fcd02a5f3606fa63888dbcffd82c (diff) | |
| download | linux-stable-e807c2a37044a51de89d6d4f8a1f5ecfb3752f36.tar.gz linux-stable-e807c2a37044a51de89d6d4f8a1f5ecfb3752f36.tar.bz2 linux-stable-e807c2a37044a51de89d6d4f8a1f5ecfb3752f36.zip | |
locking/x86: Implement local_xchg() using CMPXCHG without the LOCK prefix
Implement local_xchg() using the CMPXCHG instruction without the LOCK prefix.
XCHG is expensive due to the implied LOCK prefix. The processor
cannot prefetch cachelines if XCHG is used.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lore.kernel.org/r/20240124105816.612670-1-ubizjak@gmail.com
Diffstat (limited to 'kernel/locking')
0 files changed, 0 insertions, 0 deletions