local_t: x86_64 extension

[linux-2.6-omap-h63xx.git] / include / asm-x86_64 / system.h

diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index 213b7fe5d998235c5e1d99266c5b358655ac0b41..1f1c0bf4a5df9d361a72a4bc3a99f26b545be5ea 100644 (file)
--- a/include/asm-x86_64/system.h
+++ b/include/asm-x86_64/system.h
@@ -214,9 +214,45 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
        return old;
 }
 
+static inline unsigned long __cmpxchg_local(volatile void *ptr,
+                       unsigned long old, unsigned long new, int size)
+{
+       unsigned long prev;
+       switch (size) {
+       case 1:
+               __asm__ __volatile__("cmpxchgb %b1,%2"
+                                    : "=a"(prev)
+                                    : "q"(new), "m"(*__xg(ptr)), "0"(old)
+                                    : "memory");
+               return prev;
+       case 2:
+               __asm__ __volatile__("cmpxchgw %w1,%2"
+                                    : "=a"(prev)
+                                    : "r"(new), "m"(*__xg(ptr)), "0"(old)
+                                    : "memory");
+               return prev;
+       case 4:
+               __asm__ __volatile__("cmpxchgl %k1,%2"
+                                    : "=a"(prev)
+                                    : "r"(new), "m"(*__xg(ptr)), "0"(old)
+                                    : "memory");
+               return prev;
+       case 8:
+               __asm__ __volatile__("cmpxchgq %1,%2"
+                                    : "=a"(prev)
+                                    : "r"(new), "m"(*__xg(ptr)), "0"(old)
+                                    : "memory");
+               return prev;
+       }
+       return old;
+}
+
 #define cmpxchg(ptr,o,n)\
        ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
                                        (unsigned long)(n),sizeof(*(ptr))))
+#define cmpxchg_local(ptr,o,n)\
+       ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
+                                       (unsigned long)(n),sizeof(*(ptr))))
 
 #ifdef CONFIG_SMP
 #define smp_mb()       mb()