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Diffstat (limited to 'include/asm-s390/spinlock.h')
-rw-r--r--include/asm-s390/spinlock.h27
1 files changed, 23 insertions, 4 deletions
diff --git a/include/asm-s390/spinlock.h b/include/asm-s390/spinlock.h
index 273dbecf8ace..ce3edf6d63b3 100644
--- a/include/asm-s390/spinlock.h
+++ b/include/asm-s390/spinlock.h
@@ -11,17 +11,36 @@
#ifndef __ASM_SPINLOCK_H
#define __ASM_SPINLOCK_H
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
+
+static inline int
+_raw_compare_and_swap(volatile unsigned int *lock,
+ unsigned int old, unsigned int new)
+{
+ asm volatile(
+ " cs %0,%3,%1"
+ : "=d" (old), "=Q" (*lock)
+ : "0" (old), "d" (new), "Q" (*lock)
+ : "cc", "memory" );
+ return old;
+}
+
+#else /* __GNUC__ */
+
static inline int
_raw_compare_and_swap(volatile unsigned int *lock,
unsigned int old, unsigned int new)
{
- asm volatile ("cs %0,%3,0(%4)"
- : "=d" (old), "=m" (*lock)
- : "0" (old), "d" (new), "a" (lock), "m" (*lock)
- : "cc", "memory" );
+ asm volatile(
+ " cs %0,%3,0(%4)"
+ : "=d" (old), "=m" (*lock)
+ : "0" (old), "d" (new), "a" (lock), "m" (*lock)
+ : "cc", "memory" );
return old;
}
+#endif /* __GNUC__ */
+
/*
* Simple spin lock operations. There are two variants, one clears IRQ's
* on the local processor, one does not.