Uros Bizjak 87347f1480 futex: Use atomic64_try_cmpxchg_relaxed() in get_inode_sequence_number() ... Optimize get_inode_sequence_number() to use simpler and faster: !atomic64_try_cmpxchg_relaxed(*ptr, &old, new) instead of: atomic64_cmpxchg relaxed(*ptr, old, new) != old The x86 CMPXCHG instruction returns success in ZF flag, so this change saves a compare after cmpxchg. The generated code improves from: 3da: 31 c0 xor %eax,%eax 3dc: f0 48 0f b1 8a 38 01 lock cmpxchg %rcx,0x138(%rdx) 3e3: 00 00 3e5: 48 85 c0 test %rax,%rax 3e8: 48 0f 44 c1 cmove %rcx,%rax to: 3da: 31 c0 xor %eax,%eax 3dc: f0 48 0f b1 8a 38 01 lock cmpxchg %rcx,0x138(%rdx) 3e3: 00 00 3e5: 48 0f 44 c1 cmove %rcx,%rax Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: André Almeida <andrealmeid@igalia.com> Link: https://lore.kernel.org/all/20241010071023.21913-2-ubizjak@gmail.com		2024-10-17 22:02:27 +02:00
..
core.c	futex: Use atomic64_try_cmpxchg_relaxed() in get_inode_sequence_number()	2024-10-17 22:02:27 +02:00
futex.h	futex: make the vectored futex operations available	2023-09-29 02:37:07 -06:00
Makefile	futex: Split out wait/wake	2021-10-07 13:51:11 +02:00
pi.c	futex: Prevent the reuse of stale pi_state	2024-01-19 12:58:17 +01:00
requeue.c	plist: Split out plist_types.h	2023-12-20 19:26:31 -05:00
syscalls.c	futex: make futex_parse_waitv() available as a helper	2023-09-29 02:37:05 -06:00
waitwake.c	plist: Split out plist_types.h	2023-12-20 19:26:31 -05:00