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authorMark Rutland <mark.rutland@arm.com>2018-06-21 13:13:20 +0100
committerIngo Molnar <mingo@kernel.org>2018-06-21 14:25:24 +0200
commitb3a2a05f9111de0b79312e577608a27b0318c0a1 (patch)
tree284f54a489fe4dc810ffde4eac4aad414017202d /arch/sparc
parent9837559d8eb01ce834e56fc9a567c1d94ebd3698 (diff)
downloadlinux-b3a2a05f9111de0b79312e577608a27b0318c0a1.tar.bz2
atomics/treewide: Make conditional inc/dec ops optional
The conditional inc/dec ops differ for atomic_t and atomic64_t: - atomic_inc_unless_positive() is optional for atomic_t, and doesn't exist for atomic64_t. - atomic_dec_unless_negative() is optional for atomic_t, and doesn't exist for atomic64_t. - atomic_dec_if_positive is optional for atomic_t, and is mandatory for atomic64_t. Let's make these consistently optional for both. At the same time, let's clean up the existing fallbacks to use atomic_try_cmpxchg(). The instrumented atomics are updated accordingly. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/lkml/20180621121321.4761-18-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/include/asm/atomic_64.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/atomic_64.h b/arch/sparc/include/asm/atomic_64.h
index 304865c7cdbb..6963482c81d8 100644
--- a/arch/sparc/include/asm/atomic_64.h
+++ b/arch/sparc/include/asm/atomic_64.h
@@ -62,5 +62,6 @@ static inline int atomic_xchg(atomic_t *v, int new)
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
long atomic64_dec_if_positive(atomic64_t *v);
+#define atomic64_dec_if_positive atomic64_dec_if_positive
#endif /* !(__ARCH_SPARC64_ATOMIC__) */