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
  *