[S390] Fix gcc warning about unused return values.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h
index 36a3a85..1604004 100644 (file)
--- a/include/asm-s390/system.h
+++ b/include/asm-s390/system.h
@@ -128,8 +128,13 @@ extern void account_system_vtime(struct task_struct *);
 
 #define nop() __asm__ __volatile__ ("nop")
 
-#define xchg(ptr,x) \
-  ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(void *)(ptr),sizeof(*(ptr))))
+#define xchg(ptr,x)                                                      \
+({                                                                       \
+       __typeof__(*(ptr)) __ret;                                         \
+       __ret = (__typeof__(*(ptr)))                                      \
+               __xchg((unsigned long)(x), (void *)(ptr),sizeof(*(ptr))); \
+       __ret;                                                            \
+})
 
 static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
 {