jump_label: Add atomic_t interface

Add an interface to allow usage of jump_labels with atomic counters.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20101014203625.501657727@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/jump_label_ref.h b/include/linux/jump_label_ref.h
new file mode 100644 (file)
index 0000000..e5d012a
--- /dev/null
+++ b/include/linux/jump_label_ref.h
@@ -0,0 +1,44 @@
+#ifndef _LINUX_JUMP_LABEL_REF_H
+#define _LINUX_JUMP_LABEL_REF_H
+
+#include <linux/jump_label.h>
+#include <asm/atomic.h>
+
+#ifdef HAVE_JUMP_LABEL
+
+static inline void jump_label_inc(atomic_t *key)
+{
+       if (atomic_add_return(1, key) == 1)
+               jump_label_enable(key);
+}
+
+static inline void jump_label_dec(atomic_t *key)
+{
+       if (atomic_dec_and_test(key))
+               jump_label_disable(key);
+}
+
+#else /* !HAVE_JUMP_LABEL */
+
+static inline void jump_label_inc(atomic_t *key)
+{
+       atomic_inc(key);
+}
+
+static inline void jump_label_dec(atomic_t *key)
+{
+       atomic_dec(key);
+}
+
+#undef JUMP_LABEL
+#define JUMP_LABEL(key, label)                                         \
+do {                                                                   \
+       if (unlikely(__builtin_choose_expr(                             \
+             __builtin_types_compatible_p(typeof(key), atomic_t *),    \
+             atomic_read((atomic_t *)(key)), *(key))))                 \
+               goto label;                                             \
+} while (0)
+
+#endif /* HAVE_JUMP_LABEL */
+
+#endif /* _LINUX_JUMP_LABEL_REF_H */