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authorMark Rutland <mark.rutland@arm.com>2018-06-21 15:13:08 +0300
committerIngo Molnar <mingo@kernel.org>2018-06-21 15:22:33 +0300
commitbef828204a1bc7a0fd3a24551c4265e9c2ab95ed (patch)
treebb35ac3bc791547c1345aaa737406f9b315a9e63 /include/asm-generic
parentade5ef9280c33993099199c51e2e27c2c4013afd (diff)
downloadlinux-bef828204a1bc7a0fd3a24551c4265e9c2ab95ed.tar.xz
atomics/treewide: Make atomic64_inc_not_zero() optional
We define a trivial fallback for atomic_inc_not_zero(), but don't do the same for atomic64_inc_not_zero(), leading most architectures to define the same boilerplate. Let's add a fallback in <linux/atomic.h>, and remove the redundant implementations. Note that atomic64_add_unless() is always defined in <linux/atomic.h>, and promotes its arguments to the requisite types, so we need not do this explicitly. 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> Acked-by: Palmer Dabbelt <palmer@sifive.com> 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/20180621121321.4761-6-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/atomic-instrumented.h3
-rw-r--r--include/asm-generic/atomic64.h1
2 files changed, 3 insertions, 1 deletions
diff --git a/include/asm-generic/atomic-instrumented.h b/include/asm-generic/atomic-instrumented.h
index 497faa4a05e3..83bb88d791c4 100644
--- a/include/asm-generic/atomic-instrumented.h
+++ b/include/asm-generic/atomic-instrumented.h
@@ -205,11 +205,14 @@ static __always_inline s64 atomic64_dec_return(atomic64_t *v)
return arch_atomic64_dec_return(v);
}
+#ifdef arch_atomic64_inc_not_zero
+#define atomic64_inc_not_zero atomic64_inc_not_zero
static __always_inline bool atomic64_inc_not_zero(atomic64_t *v)
{
kasan_check_write(v, sizeof(*v));
return arch_atomic64_inc_not_zero(v);
}
+#endif
static __always_inline s64 atomic64_dec_if_positive(atomic64_t *v)
{
diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h
index a951a721e1bb..5105275ac825 100644
--- a/include/asm-generic/atomic64.h
+++ b/include/asm-generic/atomic64.h
@@ -63,6 +63,5 @@ extern bool atomic64_add_unless(atomic64_t *v, long long a, long long u);
#define atomic64_dec(v) atomic64_sub(1LL, (v))
#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v))
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
-#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL)
#endif /* _ASM_GENERIC_ATOMIC64_H */