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-rw-r--r--include/asm-generic/system.h20
1 files changed, 1 insertions, 19 deletions
diff --git a/include/asm-generic/system.h b/include/asm-generic/system.h
index efa403b5e12..4b0b9cbbfae 100644
--- a/include/asm-generic/system.h
+++ b/include/asm-generic/system.h
@@ -21,6 +21,7 @@
21#include <linux/irqflags.h> 21#include <linux/irqflags.h>
22 22
23#include <asm/cmpxchg-local.h> 23#include <asm/cmpxchg-local.h>
24#include <asm/cmpxchg.h>
24 25
25struct task_struct; 26struct task_struct;
26 27
@@ -136,25 +137,6 @@ unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
136#define xchg(ptr, x) \ 137#define xchg(ptr, x) \
137 ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) 138 ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
138 139
139static inline unsigned long __cmpxchg(volatile unsigned long *m,
140 unsigned long old, unsigned long new)
141{
142 unsigned long retval;
143 unsigned long flags;
144
145 local_irq_save(flags);
146 retval = *m;
147 if (retval == old)
148 *m = new;
149 local_irq_restore(flags);
150 return retval;
151}
152
153#define cmpxchg(ptr, o, n) \
154 ((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
155 (unsigned long)(o), \
156 (unsigned long)(n)))
157
158#endif /* !__ASSEMBLY__ */ 140#endif /* !__ASSEMBLY__ */
159 141
160#endif /* __KERNEL__ */ 142#endif /* __KERNEL__ */