From a84cd8cb496e55cafd18227e28fdd1d91b1afbe2 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Thu, 21 Jun 2018 13:13:08 +0100 Subject: [PATCH] BACKPORT: 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 , and remove the redundant implementations. Note that atomic64_add_unless() is always defined in , 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 Reviewed-by: Will Deacon Acked-by: Peter Zijlstra (Intel) Acked-by: Palmer Dabbelt Cc: Boqun Feng Cc: Linus Torvalds Cc: Thomas Gleixner Link: https://lore.kernel.org/lkml/20180621121321.4761-6-mark.rutland@arm.com Signed-off-by: Ingo Molnar Signed-off-by: Sorayukii --- arch/alpha/include/asm/atomic.h | 2 -- arch/arc/include/asm/atomic.h | 1 - arch/arm/include/asm/atomic.h | 1 - arch/arm64/include/asm/atomic.h | 2 -- arch/ia64/include/asm/atomic.h | 2 -- arch/mips/include/asm/atomic.h | 2 -- arch/parisc/include/asm/atomic.h | 2 -- arch/powerpc/include/asm/atomic.h | 1 + arch/s390/include/asm/atomic.h | 1 - arch/sparc/include/asm/atomic_64.h | 2 -- include/asm-generic/atomic-instrumented.h | 3 +++ include/asm-generic/atomic64.h | 1 - include/linux/atomic.h | 11 +++++++++++ 13 files changed, 15 insertions(+), 16 deletions(-) diff --git a/arch/alpha/include/asm/atomic.h b/arch/alpha/include/asm/atomic.h index efb69cf02cc1..363a93a61563 100644 --- a/arch/alpha/include/asm/atomic.h +++ b/arch/alpha/include/asm/atomic.h @@ -282,8 +282,6 @@ static inline long atomic64_dec_if_positive(atomic64_t *v) return old - 1; } -#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) - #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) diff --git a/arch/arc/include/asm/atomic.h b/arch/arc/include/asm/atomic.h index 7adae415acc6..7565735f7f05 100644 --- a/arch/arc/include/asm/atomic.h +++ b/arch/arc/include/asm/atomic.h @@ -601,7 +601,6 @@ static inline int 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 /* !CONFIG_GENERIC_ATOMIC64 */ diff --git a/arch/arm/include/asm/atomic.h b/arch/arm/include/asm/atomic.h index 9d56d0727c9b..02f3894faa48 100644 --- a/arch/arm/include/asm/atomic.h +++ b/arch/arm/include/asm/atomic.h @@ -534,7 +534,6 @@ static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u) #define atomic64_dec(v) atomic64_sub(1LL, (v)) #define atomic64_dec_return_relaxed(v) atomic64_sub_return_relaxed(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 /* !CONFIG_GENERIC_ATOMIC64 */ #endif diff --git a/arch/arm64/include/asm/atomic.h b/arch/arm64/include/asm/atomic.h index 264d20339f74..ad50412889c5 100644 --- a/arch/arm64/include/asm/atomic.h +++ b/arch/arm64/include/asm/atomic.h @@ -204,7 +204,5 @@ #define atomic64_add_unless(v, a, u) (___atomic_add_unless(v, a, u, 64) != u) #define atomic64_andnot atomic64_andnot -#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) - #endif #endif diff --git a/arch/ia64/include/asm/atomic.h b/arch/ia64/include/asm/atomic.h index 72b18a12dafc..936ed9058b5a 100644 --- a/arch/ia64/include/asm/atomic.h +++ b/arch/ia64/include/asm/atomic.h @@ -267,8 +267,6 @@ static __inline__ long atomic64_add_unless(atomic64_t *v, long a, long u) return c != (u); } -#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) - static __inline__ long atomic64_dec_if_positive(atomic64_t *v) { long c, old, dec; diff --git a/arch/mips/include/asm/atomic.h b/arch/mips/include/asm/atomic.h index 02fc1553cf9b..502e691c6393 100644 --- a/arch/mips/include/asm/atomic.h +++ b/arch/mips/include/asm/atomic.h @@ -644,8 +644,6 @@ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) return c != (u); } -#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) - #define atomic64_dec_return(v) atomic64_sub_return(1, (v)) #define atomic64_inc_return(v) atomic64_add_return(1, (v)) diff --git a/arch/parisc/include/asm/atomic.h b/arch/parisc/include/asm/atomic.h index e2949502d52a..b51145d54156 100644 --- a/arch/parisc/include/asm/atomic.h +++ b/arch/parisc/include/asm/atomic.h @@ -304,8 +304,6 @@ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) return c != (u); } -#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) - /* * atomic64_dec_if_positive - decrement by 1 if old value positive * @v: pointer of type atomic_t diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h index 7cf2ae279179..705d197a278c 100644 --- a/arch/powerpc/include/asm/atomic.h +++ b/arch/powerpc/include/asm/atomic.h @@ -581,6 +581,7 @@ static __inline__ int atomic64_inc_not_zero(atomic64_t *v) return t1 != 0; } +#define atomic64_inc_not_zero(v) atomic64_inc_not_zero((v)) #endif /* __powerpc64__ */ diff --git a/arch/s390/include/asm/atomic.h b/arch/s390/include/asm/atomic.h index 0ee36ff870be..879ac41c012d 100644 --- a/arch/s390/include/asm/atomic.h +++ b/arch/s390/include/asm/atomic.h @@ -340,6 +340,5 @@ static inline long long atomic64_dec_if_positive(atomic64_t *v) #define atomic64_dec(_v) atomic64_sub(1, _v) #define atomic64_dec_return(_v) atomic64_sub_return(1, _v) #define atomic64_dec_and_test(_v) (atomic64_sub_return(1, _v) == 0) -#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) #endif /* __ARCH_S390_ATOMIC__ */ diff --git a/arch/sparc/include/asm/atomic_64.h b/arch/sparc/include/asm/atomic_64.h index c52001ac292e..c1acb6196cad 100644 --- a/arch/sparc/include/asm/atomic_64.h +++ b/arch/sparc/include/asm/atomic_64.h @@ -122,8 +122,6 @@ static inline long atomic64_add_unless(atomic64_t *v, long a, long u) return c != (u); } -#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) - long atomic64_dec_if_positive(atomic64_t *v); #endif /* !(__ARCH_SPARC64_ATOMIC__) */ diff --git a/include/asm-generic/atomic-instrumented.h b/include/asm-generic/atomic-instrumented.h index ec9ba9ccdc74..da84e8232720 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 94a1d21f677e..fc8ab2943319 100644 --- a/include/asm-generic/atomic64.h +++ b/include/asm-generic/atomic64.h @@ -61,6 +61,5 @@ 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 */ diff --git a/include/linux/atomic.h b/include/linux/atomic.h index 77012f737c52..b1647aab955c 100644 --- a/include/linux/atomic.h +++ b/include/linux/atomic.h @@ -1050,6 +1050,17 @@ static inline int atomic_dec_if_positive(atomic_t *v) #define atomic64_try_cmpxchg_release atomic64_try_cmpxchg #endif /* atomic64_try_cmpxchg */ +/** + * atomic64_inc_not_zero - increment unless the number is zero + * @v: pointer of type atomic64_t + * + * Atomically increments @v by 1, if @v is non-zero. + * Returns true if the increment was done. + */ +#ifndef atomic64_inc_not_zero +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) +#endif + #ifndef atomic64_andnot static inline void atomic64_andnot(long long i, atomic64_t *v) {