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[PATCHv2,11/16] atomics/riscv: define atomic64_fetch_add_unless()

Message ID 20180529154346.3168-12-mark.rutland@arm.com
State Superseded
Headers show
Series atomics: API cleanups | expand

Commit Message

Mark Rutland May 29, 2018, 3:43 p.m. UTC 
As a step towards unifying the atomic/atomic64/atomic_long APIs, this
patch converts the arch/riscv implementation of atomic64_add_unless()
into an implementation of atomic64_fetch_add_unless().

A wrapper in <linux/atomic.h> will build atomic_add_unless() atop of
this, provided it is given a preprocessor definition.

No functional change is intended as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Albert Ou <albert@sifive.com>
---
 arch/riscv/include/asm/atomic.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

-- 
2.11.0

Comments

Palmer Dabbelt June 4, 2018, 11:17 p.m. UTC | #1 
On Tue, 29 May 2018 08:43:41 PDT (-0700), mark.rutland@arm.com wrote:
> As a step towards unifying the atomic/atomic64/atomic_long APIs, this

> patch converts the arch/riscv implementation of atomic64_add_unless()

> into an implementation of atomic64_fetch_add_unless().

>

> A wrapper in <linux/atomic.h> will build atomic_add_unless() atop of

> this, provided it is given a preprocessor definition.

>

> No functional change is intended as a result of this patch.

>

> Signed-off-by: Mark Rutland <mark.rutland@arm.com>

> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

> Cc: Boqun Feng <boqun.feng@gmail.com>

> Cc: Will Deacon <will.deacon@arm.com>

> Cc: Palmer Dabbelt <palmer@sifive.com>

> Cc: Albert Ou <albert@sifive.com>

> ---

>  arch/riscv/include/asm/atomic.h | 8 ++------

>  1 file changed, 2 insertions(+), 6 deletions(-)

>

> diff --git a/arch/riscv/include/asm/atomic.h b/arch/riscv/include/asm/atomic.h

> index 5f161daefcd2..d959bbaaad41 100644

> --- a/arch/riscv/include/asm/atomic.h

> +++ b/arch/riscv/include/asm/atomic.h

> @@ -352,7 +352,7 @@ static __always_inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)

>  #define atomic_fetch_add_unless atomic_fetch_add_unless

>

>  #ifndef CONFIG_GENERIC_ATOMIC64

> -static __always_inline long __atomic64_add_unless(atomic64_t *v, long a, long u)

> +static __always_inline long atomic64_fetch_add_unless(atomic64_t *v, long a, long u)

>  {

>         long prev, rc;

>

> @@ -369,11 +369,7 @@ static __always_inline long __atomic64_add_unless(atomic64_t *v, long a, long u)

>  		: "memory");

>  	return prev;

>  }

> -

> -static __always_inline int atomic64_add_unless(atomic64_t *v, long a, long u)

> -{

> -	return __atomic64_add_unless(v, a, u) != u;

> -}

> +#define atomic64_fetch_add_unless atomic64_fetch_add_unless

>  #endif

>

>  /*


For some reason I remember there being a reason we were doing this in such an 
odd fashion but I can't remember what it was any more.  Assuming this still 
builds, feel free to add an

Acked-by Palmer Dabbelt <palmer@sifive.com>

Thanks!
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Patch

diff --git a/arch/riscv/include/asm/atomic.h b/arch/riscv/include/asm/atomic.h
index 5f161daefcd2..d959bbaaad41 100644
--- a/arch/riscv/include/asm/atomic.h
+++ b/arch/riscv/include/asm/atomic.h
@@ -352,7 +352,7 @@  static __always_inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
 #define atomic_fetch_add_unless atomic_fetch_add_unless
 
 #ifndef CONFIG_GENERIC_ATOMIC64
-static __always_inline long __atomic64_add_unless(atomic64_t *v, long a, long u)
+static __always_inline long atomic64_fetch_add_unless(atomic64_t *v, long a, long u)
 {
        long prev, rc;
 
@@ -369,11 +369,7 @@  static __always_inline long __atomic64_add_unless(atomic64_t *v, long a, long u)
 		: "memory");
 	return prev;
 }
-
-static __always_inline int atomic64_add_unless(atomic64_t *v, long a, long u)
-{
-	return __atomic64_add_unless(v, a, u) != u;
-}
+#define atomic64_fetch_add_unless atomic64_fetch_add_unless
 #endif
 
 /*