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authorRoman Zippel <zippel@linux-m68k.org>2006-03-09 17:33:53 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-09 19:47:38 -0800
commit7b61fcda8a640bb87be23f9f09c1f24357b5c6e1 (patch)
tree691c42a07df609934cb1cba15cf94b9c04978654
parentb707dbe6c52e143a9afea06aa8f84103135ca873 (diff)
downloadop-kernel-dev-7b61fcda8a640bb87be23f9f09c1f24357b5c6e1.zip
op-kernel-dev-7b61fcda8a640bb87be23f9f09c1f24357b5c6e1.tar.gz
[PATCH] m68k: fix cmpxchg compile errors if CONFIG_RMW_INSNS=n
We require that all archs implement atomic_cmpxchg(), for the generic version of atomic_add_unless(). Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/asm-m68k/atomic.h35
1 files changed, 32 insertions, 3 deletions
diff --git a/include/asm-m68k/atomic.h b/include/asm-m68k/atomic.h
index a4a84d5..862e497 100644
--- a/include/asm-m68k/atomic.h
+++ b/include/asm-m68k/atomic.h
@@ -55,6 +55,7 @@ static inline int atomic_inc_and_test(atomic_t *v)
}
#ifdef CONFIG_RMW_INSNS
+
static inline int atomic_add_return(int i, atomic_t *v)
{
int t, tmp;
@@ -82,7 +83,12 @@ static inline int atomic_sub_return(int i, atomic_t *v)
: "g" (i), "2" (atomic_read(v)));
return t;
}
+
+#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
#else /* !CONFIG_RMW_INSNS */
+
static inline int atomic_add_return(int i, atomic_t * v)
{
unsigned long flags;
@@ -110,6 +116,32 @@ static inline int atomic_sub_return(int i, atomic_t * v)
return t;
}
+
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+ unsigned long flags;
+ int prev;
+
+ local_irq_save(flags);
+ prev = atomic_read(v);
+ if (prev == old)
+ atomic_set(v, new);
+ local_irq_restore(flags);
+ return prev;
+}
+
+static inline int atomic_xchg(atomic_t *v, int new)
+{
+ unsigned long flags;
+ int prev;
+
+ local_irq_save(flags);
+ prev = atomic_read(v);
+ atomic_set(v, new);
+ local_irq_restore(flags);
+ return prev;
+}
+
#endif /* !CONFIG_RMW_INSNS */
#define atomic_dec_return(v) atomic_sub_return(1, (v))
@@ -139,9 +171,6 @@ static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
__asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask));
}
-#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) \
({ \
int c, old; \
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