diff options
| -rw-r--r-- | include/asm-s390/system.h | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h index 64a3cd05cae..d866d338555 100644 --- a/include/asm-s390/system.h +++ b/include/asm-s390/system.h @@ -130,6 +130,8 @@ extern void pfault_fini(void); __ret; \ }) +extern void __xchg_called_with_bad_pointer(void); + static inline unsigned long __xchg(unsigned long x, void * ptr, int size) { unsigned long addr, old; @@ -150,8 +152,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size) : "=&d" (old), "=m" (*(int *) addr) : "d" (x << shift), "d" (~(255 << shift)), "a" (addr), "m" (*(int *) addr) : "memory", "cc", "0"); - x = old >> shift; - break; + return old >> shift; case 2: addr = (unsigned long) ptr; shift = (2 ^ (addr & 2)) << 3; @@ -166,8 +167,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size) : "=&d" (old), "=m" (*(int *) addr) : "d" (x << shift), "d" (~(65535 << shift)), "a" (addr), "m" (*(int *) addr) : "memory", "cc", "0"); - x = old >> shift; - break; + return old >> shift; case 4: asm volatile( " l %0,0(%3)\n" @@ -176,8 +176,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size) : "=&d" (old), "=m" (*(int *) ptr) : "d" (x), "a" (ptr), "m" (*(int *) ptr) : "memory", "cc"); - x = old; - break; + return old; #ifdef __s390x__ case 8: asm volatile( @@ -187,11 +186,11 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size) : "=&d" (old), "=m" (*(long *) ptr) : "d" (x), "a" (ptr), "m" (*(long *) ptr) : "memory", "cc"); - x = old; - break; + return old; #endif /* __s390x__ */ - } - return x; + } + __xchg_called_with_bad_pointer(); + return x; } /* @@ -206,6 +205,8 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size) ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ (unsigned long)(n),sizeof(*(ptr)))) +extern void __cmpxchg_called_with_bad_pointer(void); + static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) { @@ -270,7 +271,8 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) return prev; #endif /* __s390x__ */ } - return old; + __cmpxchg_called_with_bad_pointer(); + return old; } /* |