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authorDavid Woodhouse <David.Woodhouse@intel.com>2010-10-30 12:35:11 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-10-30 12:35:11 +0100
commit67577927e8d7a1f4b09b4992df640eadc6aacb36 (patch)
tree2e9efe6b5745965faf0dcc084d4613d9356263f9 /include/linux/jump_label_ref.h
parent6fe4c590313133ebd5dadb769031489ff178ece1 (diff)
parent51f00a471ce8f359627dd99aeac322947a0e491b (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
Conflicts: drivers/mtd/mtd_blkdevs.c Merge Grant's device-tree bits so that we can apply the subsequent fixes. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'include/linux/jump_label_ref.h')
-rw-r--r--include/linux/jump_label_ref.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/linux/jump_label_ref.h b/include/linux/jump_label_ref.h
new file mode 100644
index 00000000000..e5d012ad92c
--- /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 */