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authorMark Rutland <mark.rutland@arm.com>2023-06-05 10:01:01 +0300
committerPeter Zijlstra <peterz@infradead.org>2023-06-05 10:57:14 +0300
commitd12157efc8e083c77d054675fcdd594f54cc7e2b (patch)
tree9be23f46b4b8db9d3e36a8b551d8961d8d41822d /include/asm-generic
parenta7bafa7969da1c0e9c342c792d8224078d1c491c (diff)
downloadlinux-d12157efc8e083c77d054675fcdd594f54cc7e2b.tar.xz
locking/atomic: make atomic*_{cmp,}xchg optional
Most architectures define the atomic/atomic64 xchg and cmpxchg operations in terms of arch_xchg and arch_cmpxchg respectfully. Add fallbacks for these cases and remove the trivial cases from arch code. On some architectures the existing definitions are kept as these are used to build other arch_atomic*() operations. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20230605070124.3741859-5-mark.rutland@arm.com
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/atomic.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
index e271d6708c87..22142c71d35a 100644
--- a/include/asm-generic/atomic.h
+++ b/include/asm-generic/atomic.h
@@ -130,7 +130,4 @@ ATOMIC_OP(xor, ^)
#define arch_atomic_read(v) READ_ONCE((v)->counter)
#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
-#define arch_atomic_xchg(ptr, v) (arch_xchg(&(ptr)->counter, (u32)(v)))
-#define arch_atomic_cmpxchg(v, old, new) (arch_cmpxchg(&((v)->counter), (u32)(old), (u32)(new)))
-
#endif /* __ASM_GENERIC_ATOMIC_H */