mutex subsystem, add atomic_cmpxchg() to all arches

Index: linux/include/asm-alpha/atomic.h
===================================================================
@@ -176,6 +176,7 @@ static __inline__ long atomic64_sub_retu
 }
 
 #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)				\
 ({								\

Index: linux/include/asm-arm/atomic.h
===================================================================
@@ -99,6 +99,8 @@ static inline int atomic_cmpxchg(atomic_
 	return oldval;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
 {
 	unsigned long tmp, tmp2;

Index: linux/include/asm-arm26/atomic.h
===================================================================
@@ -76,6 +76,8 @@ static inline int atomic_cmpxchg(atomic_
 	return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
 	int ret;

Index: linux/include/asm-cris/atomic.h
===================================================================
@@ -136,6 +136,8 @@ static inline int atomic_cmpxchg(atomic_
 	return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
 	int ret;

Index: linux/include/asm-frv/atomic.h
===================================================================
@@ -415,6 +415,7 @@ extern uint32_t __cmpxchg_32(uint32_t *v
 #endif
 
 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)				\
 ({								\

Index: linux/include/asm-h8300/atomic.h
===================================================================
@@ -95,6 +95,8 @@ static inline int atomic_cmpxchg(atomic_
 	return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
 	int ret;

Index: linux/include/asm-i386/atomic.h
===================================================================
@@ -216,6 +216,7 @@ static __inline__ int atomic_sub_return(
 }
 
 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value

Index: linux/include/asm-ia64/atomic.h
===================================================================
@@ -89,6 +89,7 @@ ia64_atomic64_sub (__s64 i, atomic64_t *
 }
 
 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)				\
 ({								\

Index: linux/include/asm-m32r/atomic.h
===================================================================
@@ -243,6 +243,7 @@ static __inline__ int atomic_dec_return(
 #define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0)
 
 #define atomic_cmpxchg(v, o, n) ((int)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

Index: linux/include/asm-m68k/atomic.h
===================================================================
@@ -140,6 +140,7 @@ static inline void atomic_set_mask(unsig
 }
 
 #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)				\
 ({								\

Index: linux/include/asm-m68knommu/atomic.h
===================================================================
@@ -129,6 +129,7 @@ static inline int atomic_sub_return(int 
 }
 
 #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)				\
 ({								\

Index: linux/include/asm-mips/atomic.h
===================================================================
@@ -289,6 +289,7 @@ static __inline__ int atomic_sub_if_posi
 }
 
 #define atomic_cmpxchg(v, o, n) ((int)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

Index: linux/include/asm-parisc/atomic.h
===================================================================
@@ -165,6 +165,7 @@ static __inline__ int atomic_read(const 
 
 /* exported interface */
 #define atomic_cmpxchg(v, o, n) ((int)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

Index: linux/include/asm-powerpc/atomic.h
===================================================================
@@ -165,6 +165,7 @@ static __inline__ int atomic_dec_return(
 }
 
 #define atomic_cmpxchg(v, o, n) ((int)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

Index: linux/include/asm-s390/atomic.h
===================================================================
@@ -199,6 +199,7 @@ atomic_compare_and_swap(int expected_old
 }
 
 #define atomic_cmpxchg(v, o, n) (atomic_compare_and_swap((o), (n), &((v)->counter)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)				\
 ({								\

Index: linux/include/asm-sh/atomic.h
===================================================================
@@ -101,6 +101,8 @@ static inline int atomic_cmpxchg(atomic_
 	return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
 	int ret;

Index: linux/include/asm-sh64/atomic.h
===================================================================
@@ -113,6 +113,8 @@ static inline int atomic_cmpxchg(atomic_
 	return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
 	int ret;

Index: linux/include/asm-sparc/atomic.h
===================================================================
@@ -20,6 +20,7 @@ typedef struct { volatile int counter; }
 
 extern int __atomic_add_return(int, atomic_t *);
 extern int atomic_cmpxchg(atomic_t *, int, int);
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 extern int atomic_add_unless(atomic_t *, int, int);
 extern void atomic_set(atomic_t *, int);
 

Index: linux/include/asm-sparc64/atomic.h
===================================================================
@@ -72,6 +72,7 @@ extern int atomic64_sub_ret(int, atomic6
 #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
 
 #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)				\
 ({								\

Index: linux/include/asm-v850/atomic.h
===================================================================
@@ -104,6 +104,8 @@ static inline int atomic_cmpxchg(atomic_
 	return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
 	int ret;

Index: linux/include/asm-x86_64/atomic.h
===================================================================
@@ -389,6 +389,7 @@ static __inline__ long atomic64_sub_retu
 #define atomic64_dec_return(v)  (atomic64_sub_return(1,v))
 
 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value

Index: linux/include/asm-xtensa/atomic.h
===================================================================
@@ -224,6 +224,7 @@ static inline int atomic_sub_return(int 
 #define atomic_add_negative(i,v) (atomic_add_return((i),(v)) < 0)
 
 #define atomic_cmpxchg(v, o, n) ((int)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