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| author | Uros Bizjak <[email protected]> | 2023-01-16 16:53:37 +0000 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2023-02-06 13:22:09 +0000 |
| commit | 915d4ad3830aa1a2dafda9b737749fb410cb9790 (patch) | |
| tree | e8287c524625634c219ad3dc4e553a1d429bdcec /tools/perf/scripts/python/arm-cs-trace-disasm.py | |
| parent | vdso/bits.h: Add BIT_ULL() for the sake of consistency (diff) | |
| download | kernel-915d4ad3830aa1a2dafda9b737749fb410cb9790.tar.gz kernel-915d4ad3830aa1a2dafda9b737749fb410cb9790.zip | |
posix-timers: Use atomic64_try_cmpxchg() in __update_gt_cputime()
Use atomic64_try_cmpxchg() instead of atomic64_cmpxchg() in
__update_gt_cputime(). The 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, atomic64_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]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/arm-cs-trace-disasm.py')
0 files changed, 0 insertions, 0 deletions