Commit 5cd4c268 authored by Uros Bizjak's avatar Uros Bizjak Committed by Ingo Molnar
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locking/x86: Define arch_try_cmpxchg_local() 



Define target specific arch_try_cmpxchg_local(). This
definition overrides the generic arch_try_cmpxchg_local()
fallback definition and enables target-specific
implementation of try_cmpxchg_local().

Signed-off-by: default avatarUros Bizjak <ubizjak@gmail.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230405141710.3551-5-ubizjak@gmail.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
parent d994f2c8

arch/x86/include/asm/cmpxchg.h

+6 −0
Original line number Diff line number Diff line
@@ -221,9 +221,15 @@ extern void __add_wrong_size(void) 
#define __try_cmpxchg(ptr, pold, new, size)				\

	__raw_try_cmpxchg((ptr), (pold), (new), (size), LOCK_PREFIX)



#define __try_cmpxchg_local(ptr, pold, new, size)			\

	__raw_try_cmpxchg((ptr), (pold), (new), (size), "")



#define arch_try_cmpxchg(ptr, pold, new) 				\

	__try_cmpxchg((ptr), (pold), (new), sizeof(*(ptr)))



#define arch_try_cmpxchg_local(ptr, pold, new)				\

	__try_cmpxchg_local((ptr), (pold), (new), sizeof(*(ptr)))



/*

 * xadd() adds "inc" to "*ptr" and atomically returns the previous

 * value of "*ptr".