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authorArun Sharma <asharma@fb.com>2011-07-26 16:09:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-26 16:49:47 -0700
commitf24219b4e90cf70ec4a211b17fbabc725a0ddf3c (patch)
treec1c753bd425d61a5094995d9835b23b46383d9b2
parent60063497a95e716c9a689af3be2687d261f115b4 (diff)
atomic: move atomic_add_unless to generic code
This is in preparation for more generic atomic primitives based on __atomic_add_unless. Signed-off-by: Arun Sharma <asharma@fb.com> Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Miller <davem@davemloft.net> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/alpha/include/asm/atomic.h10
-rw-r--r--arch/arm/include/asm/atomic.h4
-rw-r--r--arch/avr32/include/asm/atomic.h57
-rw-r--r--arch/blackfin/include/asm/atomic.h4
-rw-r--r--arch/cris/include/asm/atomic.h4
-rw-r--r--arch/frv/include/asm/atomic.h4
-rw-r--r--arch/h8300/include/asm/atomic.h4
-rw-r--r--arch/ia64/include/asm/atomic.h4
-rw-r--r--arch/m32r/include/asm/atomic.h8
-rw-r--r--arch/m68k/include/asm/atomic.h4
-rw-r--r--arch/mips/include/asm/atomic.h10
-rw-r--r--arch/mn10300/include/asm/atomic.h4
-rw-r--r--arch/parisc/include/asm/atomic.h10
-rw-r--r--arch/powerpc/include/asm/atomic.h14
-rw-r--r--arch/s390/include/asm/atomic.h4
-rw-r--r--arch/sh/include/asm/atomic.h8
-rw-r--r--arch/sparc/include/asm/atomic_32.h2
-rw-r--r--arch/sparc/include/asm/atomic_64.h4
-rw-r--r--arch/tile/include/asm/atomic_32.h10
-rw-r--r--arch/tile/include/asm/atomic_64.h4
-rw-r--r--arch/x86/include/asm/atomic.h8
-rw-r--r--arch/x86/include/asm/atomic64_32.h2
-rw-r--r--arch/x86/include/asm/atomic64_64.h2
-rw-r--r--arch/xtensa/include/asm/atomic.h8
-rw-r--r--include/asm-generic/atomic.h4
-rw-r--r--include/linux/atomic.h14
26 files changed, 109 insertions, 102 deletions
diff --git a/arch/alpha/include/asm/atomic.h b/arch/alpha/include/asm/atomic.h
index 88b7491490bc..3d6704910268 100644
--- a/arch/alpha/include/asm/atomic.h
+++ b/arch/alpha/include/asm/atomic.h
@@ -176,15 +176,15 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
- * atomic_add_unless - add unless the number is a given value
+ * __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -196,7 +196,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
@@ -207,7 +207,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
diff --git a/arch/arm/include/asm/atomic.h b/arch/arm/include/asm/atomic.h
index 4d501f1bdc9d..3757e91c5281 100644
--- a/arch/arm/include/asm/atomic.h
+++ b/arch/arm/include/asm/atomic.h
@@ -208,14 +208,14 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
c = old;
- return c != u;
+ return c;
}
#define atomic_inc(v) atomic_add(1, v)
diff --git a/arch/avr32/include/asm/atomic.h b/arch/avr32/include/asm/atomic.h
index f229c3849f03..dc6c3a41a2d7 100644
--- a/arch/avr32/include/asm/atomic.h
+++ b/arch/avr32/include/asm/atomic.h
@@ -78,70 +78,63 @@ static inline int atomic_add_return(int i, atomic_t *v)
/*
* atomic_sub_unless - sub unless the number is a given value
* @v: pointer of type atomic_t
- * @a: the amount to add to v...
+ * @a: the amount to subtract from v...
* @u: ...unless v is equal to u.
*
- * If the atomic value v is not equal to u, this function subtracts a
- * from v, and returns non zero. If v is equal to u then it returns
- * zero. This is done as an atomic operation.
+ * Atomically subtract @a from @v, so long as it was not @u.
+ * Returns the old value of @v.
*/
-static inline int atomic_sub_unless(atomic_t *v, int a, int u)
+static inline void atomic_sub_unless(atomic_t *v, int a, int u)
{
- int tmp, result = 0;
+ int tmp;
asm volatile(
"/* atomic_sub_unless */\n"
"1: ssrf 5\n"
- " ld.w %0, %3\n"
- " cp.w %0, %5\n"
+ " ld.w %0, %2\n"
+ " cp.w %0, %4\n"
" breq 1f\n"
- " sub %0, %4\n"
- " stcond %2, %0\n"
+ " sub %0, %3\n"
+ " stcond %1, %0\n"
" brne 1b\n"
- " mov %1, 1\n"
"1:"
- : "=&r"(tmp), "=&r"(result), "=o"(v->counter)
- : "m"(v->counter), "rKs21"(a), "rKs21"(u), "1"(result)
+ : "=&r"(tmp), "=o"(v->counter)
+ : "m"(v->counter), "rKs21"(a), "rKs21"(u)
: "cc", "memory");
-
- return result;
}
/*
- * atomic_add_unless - add unless the number is a given value
+ * __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
- * If the atomic value v is not equal to u, this function adds a to v,
- * and returns non zero. If v is equal to u then it returns zero. This
- * is done as an atomic operation.
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns the old value of @v.
*/
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
- int tmp, result;
+ int tmp, old = atomic_read(v);
if (__builtin_constant_p(a) && (a >= -1048575) && (a <= 1048576))
- result = atomic_sub_unless(v, -a, u);
+ atomic_sub_unless(v, -a, u);
else {
- result = 0;
asm volatile(
- "/* atomic_add_unless */\n"
+ "/* __atomic_add_unless */\n"
"1: ssrf 5\n"
- " ld.w %0, %3\n"
- " cp.w %0, %5\n"
+ " ld.w %0, %2\n"
+ " cp.w %0, %4\n"
" breq 1f\n"
- " add %0, %4\n"
- " stcond %2, %0\n"
+ " add %0, %3\n"
+ " stcond %1, %0\n"
" brne 1b\n"
- " mov %1, 1\n"
"1:"
- : "=&r"(tmp), "=&r"(result), "=o"(v->counter)
- : "m"(v->counter), "r"(a), "ir"(u), "1"(result)
+ : "=&r"(tmp), "=o"(v->counter)
+ : "m"(v->counter), "r"(a), "ir"(u)
: "cc", "memory");
}
- return result;
+ return old;
}
/*
diff --git a/arch/blackfin/include/asm/atomic.h b/arch/blackfin/include/asm/atomic.h
index f2cf5b714ea4..292c86f74f85 100644
--- a/arch/blackfin/include/asm/atomic.h
+++ b/arch/blackfin/include/asm/atomic.h
@@ -89,13 +89,13 @@ static inline void atomic_set_mask(int mask, atomic_t *v)
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-#define atomic_add_unless(v, a, u) \
+#define __atomic_add_unless(v, a, u) \
({ \
int c, old; \
c = atomic_read(v); \
while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
c = old; \
- c != (u); \
+ c; \
})
/*
diff --git a/arch/cris/include/asm/atomic.h b/arch/cris/include/asm/atomic.h
index ce9f67e4d977..7e90532c5253 100644
--- a/arch/cris/include/asm/atomic.h
+++ b/arch/cris/include/asm/atomic.h
@@ -138,7 +138,7 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int ret;
unsigned long flags;
@@ -148,7 +148,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
if (ret != u)
v->counter += a;
cris_atomic_restore(v, flags);
- return ret != u;
+ return ret;
}
/* Atomic operations are already serializing */
diff --git a/arch/frv/include/asm/atomic.h b/arch/frv/include/asm/atomic.h
index b07b75f411f2..a51dcdfe1fbf 100644
--- a/arch/frv/include/asm/atomic.h
+++ b/arch/frv/include/asm/atomic.h
@@ -241,7 +241,7 @@ extern uint32_t __xchg_32(uint32_t i, volatile void *v);
#define atomic64_cmpxchg(v, old, new) (__cmpxchg_64(old, new, &(v)->counter))
#define atomic64_xchg(v, new) (__xchg_64(new, &(v)->counter))
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -253,7 +253,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
diff --git a/arch/h8300/include/asm/atomic.h b/arch/h8300/include/asm/atomic.h
index b641714774ea..e6d1663625f0 100644
--- a/arch/h8300/include/asm/atomic.h
+++ b/arch/h8300/include/asm/atomic.h
@@ -104,7 +104,7 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int ret;
unsigned long flags;
@@ -114,7 +114,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
if (ret != u)
v->counter += a;
local_irq_restore(flags);
- return ret != u;
+ return ret;
}
static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
diff --git a/arch/ia64/include/asm/atomic.h b/arch/ia64/include/asm/atomic.h
index fdb887005dff..22aca210bd05 100644
--- a/arch/ia64/include/asm/atomic.h
+++ b/arch/ia64/include/asm/atomic.h
@@ -90,7 +90,7 @@ ia64_atomic64_sub (__s64 i, atomic64_t *v)
(cmpxchg(&((v)->counter), old, new))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -102,7 +102,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
diff --git a/arch/m32r/include/asm/atomic.h b/arch/m32r/include/asm/atomic.h
index d64d894dc549..c839426ac732 100644
--- a/arch/m32r/include/asm/atomic.h
+++ b/arch/m32r/include/asm/atomic.h
@@ -239,15 +239,15 @@ static __inline__ int atomic_dec_return(atomic_t *v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
- * atomic_add_unless - add unless the number is a given value
+ * __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -259,7 +259,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
diff --git a/arch/m68k/include/asm/atomic.h b/arch/m68k/include/asm/atomic.h
index e844a2d2ba23..2269350974f1 100644
--- a/arch/m68k/include/asm/atomic.h
+++ b/arch/m68k/include/asm/atomic.h
@@ -183,7 +183,7 @@ static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
__asm__ __volatile__("orl %1,%0" : "+m" (*v) : ASM_DI (mask));
}
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -195,7 +195,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
diff --git a/arch/mips/include/asm/atomic.h b/arch/mips/include/asm/atomic.h
index 833a4023648a..31cb23debb7e 100644
--- a/arch/mips/include/asm/atomic.h
+++ b/arch/mips/include/asm/atomic.h
@@ -303,15 +303,15 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
/**
- * atomic_add_unless - add unless the number is a given value
+ * __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -323,7 +323,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
#define atomic_dec_return(v) atomic_sub_return(1, (v))
@@ -679,7 +679,7 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
diff --git a/arch/mn10300/include/asm/atomic.h b/arch/mn10300/include/asm/atomic.h
index 041b9d69d86c..a2e6759af4db 100644
--- a/arch/mn10300/include/asm/atomic.h
+++ b/arch/mn10300/include/asm/atomic.h
@@ -260,13 +260,13 @@ static inline void atomic_dec(atomic_t *v)
#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
-#define atomic_add_unless(v, a, u) \
+#define __atomic_add_unless(v, a, u) \
({ \
int c, old; \
c = atomic_read(v); \
while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
c = old; \
- c != (u); \
+ c; \
})
diff --git a/arch/parisc/include/asm/atomic.h b/arch/parisc/include/asm/atomic.h
index 192488999b63..1914f179879d 100644
--- a/arch/parisc/include/asm/atomic.h
+++ b/arch/parisc/include/asm/atomic.h
@@ -197,15 +197,15 @@ static __inline__ int atomic_read(const atomic_t *v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
- * atomic_add_unless - add unless the number is a given value
+ * __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -217,7 +217,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
@@ -316,7 +316,7 @@ atomic64_read(const atomic64_t *v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
index b2bcbee622ea..952e161fbb89 100644
--- a/arch/powerpc/include/asm/atomic.h
+++ b/arch/powerpc/include/asm/atomic.h
@@ -181,21 +181,21 @@ static __inline__ int atomic_dec_return(atomic_t *v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
- * atomic_add_unless - add unless the number is a given value
+ * __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int t;
__asm__ __volatile__ (
PPC_RELEASE_BARRIER
-"1: lwarx %0,0,%1 # atomic_add_unless\n\
+"1: lwarx %0,0,%1 # __atomic_add_unless\n\
cmpw 0,%0,%3 \n\
beq- 2f \n\
add %0,%2,%0 \n"
@@ -209,7 +209,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
: "r" (&v->counter), "r" (a), "r" (u)
: "cc", "memory");
- return t != u;
+ return t;
}
@@ -443,7 +443,7 @@ static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
@@ -451,7 +451,7 @@ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
__asm__ __volatile__ (
PPC_RELEASE_BARRIER
-"1: ldarx %0,0,%1 # atomic_add_unless\n\
+"1: ldarx %0,0,%1 # __atomic_add_unless\n\
cmpd 0,%0,%3 \n\
beq- 2f \n\
add %0,%2,%0 \n"
diff --git a/arch/s390/include/asm/atomic.h b/arch/s390/include/asm/atomic.h
index 29d756329228..7b0b0a7193e5 100644
--- a/arch/s390/include/asm/atomic.h
+++ b/arch/s390/include/asm/atomic.h
@@ -93,7 +93,7 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
return old;
}
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -105,7 +105,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != u;
+ return c;
}
diff --git a/arch/sh/include/asm/atomic.h b/arch/sh/include/asm/atomic.h
index 8ddb2635cf92..2177596d4b38 100644
--- a/arch/sh/include/asm/atomic.h
+++ b/arch/sh/include/asm/atomic.h
@@ -38,15 +38,15 @@
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
/**
- * atomic_add_unless - add unless the number is a given value
+ * __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -59,7 +59,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
c = old;
}
- return c != (u);
+ return c;
}
#define smp_mb__before_atomic_dec() smp_mb()
diff --git a/arch/sparc/include/asm/atomic_32.h b/arch/sparc/include/asm/atomic_32.h
index 7646f2cef5d0..bdce95e77f85 100644
--- a/arch/sparc/include/asm/atomic_32.h
+++ b/arch/sparc/include/asm/atomic_32.h
@@ -22,7 +22,7 @@
extern int __atomic_add_return(int, atomic_t *);
extern int atomic_cmpxchg(atomic_t *, int, int);
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-extern int atomic_add_unless(atomic_t *, int, int);
+extern int __atomic_add_unless(atomic_t *, int, int);
extern void atomic_set(atomic_t *, int);
#define atomic_read(v) (*(volatile int *)&(v)->counter)
diff --git a/arch/sparc/include/asm/atomic_64.h b/arch/sparc/include/asm/atomic_64.h
index 337139ef91be..1fc3d0a62d66 100644
--- a/arch/sparc/include/asm/atomic_64.h
+++ b/arch/sparc/include/asm/atomic_64.h
@@ -70,7 +70,7 @@ extern long atomic64_sub_ret(long, atomic64_t *);
#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -82,7 +82,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
diff --git a/arch/tile/include/asm/atomic_32.h b/arch/tile/include/asm/atomic_32.h
index 246feed4794d..c03349e0ca9f 100644
--- a/arch/tile/include/asm/atomic_32.h
+++ b/arch/tile/include/asm/atomic_32.h
@@ -81,18 +81,18 @@ static inline int atomic_add_return(int i, atomic_t *v)
}
/**
- * atomic_add_unless - add unless the number is already a given value
+ * __atomic_add_unless - add unless the number is already a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as @v was not already @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
smp_mb(); /* barrier for proper semantics */
- return _atomic_xchg_add_unless(v, a, u) != u;
+ return _atomic_xchg_add_unless(v, a, u);
}
/**
@@ -199,7 +199,7 @@ static inline u64 atomic64_add_return(u64 i, atomic64_t *v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as @v was not already @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
static inline u64 atomic64_add_unless(atomic64_t *v, u64 a, u64 u)
{
diff --git a/arch/tile/include/asm/atomic_64.h b/arch/tile/include/asm/atomic_64.h
index a48dda30cbcc..27fe667fddfe 100644
--- a/arch/tile/include/asm/atomic_64.h
+++ b/arch/tile/include/asm/atomic_64.h
@@ -64,7 +64,7 @@ static inline int atomic_add_return(int i, atomic_t *v)
return val;
}
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int guess, oldval = v->counter;
do {
@@ -73,7 +73,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
guess = oldval;
oldval = atomic_cmpxchg(v, guess, guess + a);
} while (guess != oldval);
- return oldval != u;
+ return oldval;
}
/* Now the true 64-bit operations. */
diff --git a/arch/x86/include/asm/atomic.h b/arch/x86/include/asm/atomic.h
index 897969bdd4e6..5fe9cb335cd2 100644
--- a/arch/x86/include/asm/atomic.h
+++ b/arch/x86/include/asm/atomic.h
@@ -221,15 +221,15 @@ static inline int atomic_xchg(atomic_t *v, int new)
}
/**
- * atomic_add_unless - add unless the number is already a given value
+ * __atomic_add_unless - add unless the number is already a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as @v was not already @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -241,7 +241,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
diff --git a/arch/x86/include/asm/atomic64_32.h b/arch/x86/include/asm/atomic64_32.h
index 2a934aa19a43..24098aafce0d 100644
--- a/arch/x86/include/asm/atomic64_32.h
+++ b/arch/x86/include/asm/atomic64_32.h
@@ -263,7 +263,7 @@ static inline int atomic64_add_negative(long long i, atomic64_t *v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
{
diff --git a/arch/x86/include/asm/atomic64_64.h b/arch/x86/include/asm/atomic64_64.h
index 49fd1ea22951..017594d403f6 100644
--- a/arch/x86/include/asm/atomic64_64.h
+++ b/arch/x86/include/asm/atomic64_64.h
@@ -202,7 +202,7 @@ static inline long atomic64_xchg(atomic64_t *v, long new)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
static inline int atomic64_add_unless(atomic64_t *v, long a, long u)
{
diff --git a/arch/xtensa/include/asm/atomic.h b/arch/xtensa/include/asm/atomic.h
index 7cca2fb18baf..e464212f9ee6 100644
--- a/arch/xtensa/include/asm/atomic.h
+++ b/arch/xtensa/include/asm/atomic.h
@@ -225,15 +225,15 @@ static inline int atomic_sub_return(int i, atomic_t * v)
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
- * atomic_add_unless - add unless the number is a given value
+ * __atomic_add_unless - add unless the number is a given value
* @v: pointer of type atomic_t
* @a: the amount to add to v...
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as it was not @u.
- * Returns non-zero if @v was not @u, and zero otherwise.
+ * Returns the old value of @v.
*/
-static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
@@ -245,7 +245,7 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
break;
c = old;
}
- return c != (u);
+ return c;
}
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
index 7f84414c5f53..bd18bfd78e9b 100644
--- a/include/asm-generic/atomic.h
+++ b/include/asm-generic/atomic.h
@@ -129,13 +129,13 @@ static inline void atomic_dec(atomic_t *v)
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
int c, old;
c = atomic_read(v);
while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c)
c = old;
- return c != u;
+ return c;
}
static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index 66fed6364122..d5e167a6a398 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -3,6 +3,20 @@
#include <asm/atomic.h>
/**
+ * atomic_add_unless - add unless the number is already a given value
+ * @v: pointer of type atomic_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as @v was not already @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+ return __atomic_add_unless(v, a, u) != u;
+}
+
+/**
* atomic_inc_not_zero - increment unless the number is zero
* @v: pointer of type atomic_t
*

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