#ifndef _XTENSA_ATOMIC_H
#define _XTENSA_ATOMIC_H
-#include <linux/config.h>
#include <linux/stringify.h>
typedef struct { volatile int counter; } atomic_t;
*/
#define atomic_add_negative(i,v) (atomic_add_return((i),(v)) < 0)
+#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+/**
+ * atomic_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+#define atomic_add_unless(v, a, u) \
+({ \
+ int c, old; \
+ c = atomic_read(v); \
+ while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
+ c = old; \
+ c != (u); \
+})
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
{
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
+#include <asm-generic/atomic.h>
#endif /* __KERNEL__ */
#endif /* _XTENSA_ATOMIC_H */