diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-05-05 12:56:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-05-05 12:56:55 -0700 |
| commit | b115d85a9584c98f9a7dec209d835462aa1adc09 (patch) | |
| tree | 332af6e2fafef47b9dc9891282b422eb5dcc5f3f /arch/arm64 | |
| parent | d5ed10bb80bb376501cb56015a47457647efaabf (diff) | |
| parent | ec570320b09f76d52819e60abdccf372658216b6 (diff) | |
| download | lwn-b115d85a9584c98f9a7dec209d835462aa1adc09.tar.gz lwn-b115d85a9584c98f9a7dec209d835462aa1adc09.zip | |
Merge tag 'locking-core-2023-05-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
- Introduce local{,64}_try_cmpxchg() - a slightly more optimal
primitive, which will be used in perf events ring-buffer code
- Simplify/modify rwsems on PREEMPT_RT, to address writer starvation
- Misc cleanups/fixes
* tag 'locking-core-2023-05-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/atomic: Correct (cmp)xchg() instrumentation
locking/x86: Define arch_try_cmpxchg_local()
locking/arch: Wire up local_try_cmpxchg()
locking/generic: Wire up local{,64}_try_cmpxchg()
locking/atomic: Add generic try_cmpxchg{,64}_local() support
locking/rwbase: Mitigate indefinite writer starvation
locking/arch: Rename all internal __xchg() names to __arch_xchg()
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/cmpxchg.h | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/arm64/include/asm/cmpxchg.h b/arch/arm64/include/asm/cmpxchg.h index 497acf134d99..c6bc5d8ec3ca 100644 --- a/arch/arm64/include/asm/cmpxchg.h +++ b/arch/arm64/include/asm/cmpxchg.h @@ -62,9 +62,8 @@ __XCHG_CASE( , , mb_, 64, dmb ish, nop, , a, l, "memory") #undef __XCHG_CASE #define __XCHG_GEN(sfx) \ -static __always_inline unsigned long __xchg##sfx(unsigned long x, \ - volatile void *ptr, \ - int size) \ +static __always_inline unsigned long \ +__arch_xchg##sfx(unsigned long x, volatile void *ptr, int size) \ { \ switch (size) { \ case 1: \ @@ -93,7 +92,7 @@ __XCHG_GEN(_mb) ({ \ __typeof__(*(ptr)) __ret; \ __ret = (__typeof__(*(ptr))) \ - __xchg##sfx((unsigned long)(x), (ptr), sizeof(*(ptr))); \ + __arch_xchg##sfx((unsigned long)(x), (ptr), sizeof(*(ptr))); \ __ret; \ }) |