[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>
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@ -55,6 +55,7 @@ static inline int atomic_inc_and_test(atomic_t *v)
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}
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#ifdef CONFIG_RMW_INSNS
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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int t, tmp;
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@ -82,7 +83,12 @@ static inline int atomic_sub_return(int i, atomic_t *v)
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: "g" (i), "2" (atomic_read(v)));
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return t;
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}
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#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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#else /* !CONFIG_RMW_INSNS */
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static inline int atomic_add_return(int i, atomic_t * v)
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{
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unsigned long flags;
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@ -110,6 +116,32 @@ static inline int atomic_sub_return(int i, atomic_t * v)
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return t;
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}
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static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
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{
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unsigned long flags;
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int prev;
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local_irq_save(flags);
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prev = atomic_read(v);
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if (prev == old)
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atomic_set(v, new);
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local_irq_restore(flags);
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return prev;
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}
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static inline int atomic_xchg(atomic_t *v, int new)
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{
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unsigned long flags;
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int prev;
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local_irq_save(flags);
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prev = atomic_read(v);
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atomic_set(v, new);
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local_irq_restore(flags);
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return prev;
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}
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#endif /* !CONFIG_RMW_INSNS */
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#define atomic_dec_return(v) atomic_sub_return(1, (v))
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@ -139,9 +171,6 @@ static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
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__asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask));
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}
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#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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#define atomic_add_unless(v, a, u) \
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({ \
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int c, old; \
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