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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2007-05-08 00:34:24 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:19 -0700
commite12f644bd085ce64a6ecca4e466fcdc2c2df4c0f (patch)
treefef1105bc80332945ca73fa77b3aae27e9b92bdc /include
parent819791319becde19e32788a34cc2556aef9f9e6d (diff)
atomic.h: add atomic64 cmpxchg, xchg and add_unless to mips
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-mips/atomic.h29
1 files changed, 26 insertions, 3 deletions
diff --git a/include/asm-mips/atomic.h b/include/asm-mips/atomic.h
index 1ac50b6c47a..6423ffa195a 100644
--- a/include/asm-mips/atomic.h
+++ b/include/asm-mips/atomic.h
@@ -306,8 +306,8 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
return result;
}
-#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
/**
* atomic_add_unless - add unless the number is a given value
@@ -320,7 +320,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
*/
#define atomic_add_unless(v, a, u) \
({ \
- int c, old; \
+ __typeof__((v)->counter) c, old; \
c = atomic_read(v); \
while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
c = old; \
@@ -681,6 +681,29 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
return result;
}
+#define atomic64_cmpxchg(v, o, n) \
+ (((__typeof__((v)->counter)))cmpxchg(&((v)->counter), (o), (n)))
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), (new)))
+
+/**
+ * atomic64_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic64_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.
+ */
+#define atomic64_add_unless(v, a, u) \
+({ \
+ __typeof__((v)->counter) c, old; \
+ c = atomic_read(v); \
+ while (c != (u) && (old = atomic64_cmpxchg((v), c, c + (a))) != c) \
+ c = old; \
+ 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))