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Locking changes in v6.4:

Browse source 
- 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.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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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()
This commit is contained in:
Linus Torvalds 2023-05-05 12:56:55 -07:00
commit b115d85a95
33 changed files with 209 additions and 111 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/ia64/include/asm/cmpxchg.h
View file

@ -5,7 +5,7 @@
#include <uapi/asm/cmpxchg.h>
#define arch_xchg(ptr, x) \
({(__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr)));})
({(__typeof__(*(ptr))) __arch_xchg((unsigned long) (x), (ptr), sizeof(*(ptr)));})
#define arch_cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n))
#define arch_cmpxchg64(ptr, o, n) cmpxchg_acq((ptr), (o), (n))

4
arch/ia64/include/uapi/asm/cmpxchg.h
View file

@ -23,7 +23,7 @@
*/
extern void ia64_xchg_called_with_bad_pointer(void);
#define __xchg(x, ptr, size) \
#define __arch_xchg(x, ptr, size) \
({ \
unsigned long __xchg_result; \
\
@ -51,7 +51,7 @@ extern void ia64_xchg_called_with_bad_pointer(void);
#ifndef __KERNEL__
#define xchg(ptr, x) \
({(__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr)));})
({(__typeof__(*(ptr))) __arch_xchg((unsigned long) (x), (ptr), sizeof(*(ptr)));})
#endif
/*