#define __ASM_ARM_ATOMIC_H
#include <linux/config.h>
+#include <linux/compiler.h>
typedef struct { volatile int counter; } atomic_t;
static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
{
- u32 oldval, res;
+ unsigned long oldval, res;
do {
__asm__ __volatile__("@ atomic_cmpxchg\n"
"ldrex %1, [%2]\n"
+ "mov %0, #0\n"
"teq %1, %3\n"
"strexeq %0, %4, [%2]\n"
: "=&r" (res), "=&r" (oldval)
#endif /* __LINUX_ARM_ARCH__ */
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+ int c, old;
+
+ c = atomic_read(v);
+ while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
+ c = old;
+ return c != u;
+}
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
#define atomic_add(i, v) (void) atomic_add_return(i, v)
#define atomic_inc(v) (void) atomic_add_return(1, v)
#define atomic_sub(i, v) (void) atomic_sub_return(i, v)
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif
#endif