Fix cmpxchg
Signed-off-by: Atle Nissestad <[EMAIL PROTECTED]>
diff --git a/linux-2.6.x/include/asm-nios2nommu/system.h
b/linux-2.6.x/include/asm-nios2nommu/system.h
index 7c35af0..d5b4822 100644
--- a/linux-2.6.x/include/asm-nios2nommu/system.h
+++ b/linux-2.6.x/include/asm-nios2nommu/system.h
@@ -156,11 +156,15 @@ static inline unsigned long __xchg(unsigned long x,
volatile void * ptr, int siz
*/
#define __HAVE_ARCH_CMPXCHG 1
+/* This function doesn't exist, so you'll get a linker error
+ if something tries to do an invalid cmpxchg(). */
+extern void __cmpxchg_called_with_bad_pointer(void);
+
static __inline__ unsigned long
-cmpxchg(volatile int *p, int old, int new)
+__cmpxchg_u32(volatile unsigned long *p, unsigned long old, unsigned long new)
{
unsigned long flags;
- int prev;
+ unsigned long prev;
local_irq_save(flags);
if ((prev = *p) == old)
@@ -169,4 +173,22 @@ cmpxchg(volatile int *p, int old, int new)
return(prev);
}
+static inline unsigned long
+__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
+{
+ if (size == 4)
+ return __cmpxchg_u32(ptr, old, new);
+
+ __cmpxchg_called_with_bad_pointer();
+ return old;
+}
+
+#define cmpxchg(ptr,o,n) \
+ ({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
+ (unsigned long)_n_, sizeof(*(ptr))); \
+ })
+
#endif /* _NIOS2NOMMU_SYSTEM_H */
--
1.5.3.2
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