[tip:ras/core] locking/static_keys: Provide DECLARE and well as DEFINE macros

[tip-bot for Tony Luck]

Commit-ID:  b8fb03785d4de097507d0cf45873525e0ac4d2b2
Gitweb:     http://git.kernel.org/tip/b8fb03785d4de097507d0cf45873525e0ac4d2b2
Author:     Tony Luck <tony.luck@xxxxxxxxx>
AuthorDate: Thu, 1 Sep 2016 11:39:33 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 5 Sep 2016 11:47:31 +0200

locking/static_keys: Provide DECLARE and well as DEFINE macros

We will need to provide declarations of static keys in header
files. Provide DECLARE_STATIC_KEY_{TRUE,FALSE} macros.

Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Acked-by: Borislav Petkov <bp@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/816881cf85bd3cf13385d212882618f38a3b5d33.1472754711.git.tony.luck@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 include/linux/jump_label.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 661af56..595fb46 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -267,9 +267,15 @@ struct static_key_false {
 #define DEFINE_STATIC_KEY_TRUE(name)	\
 	struct static_key_true name = STATIC_KEY_TRUE_INIT
 
+#define DECLARE_STATIC_KEY_TRUE(name)	\
+	extern struct static_key_true name
+
 #define DEFINE_STATIC_KEY_FALSE(name)	\
 	struct static_key_false name = STATIC_KEY_FALSE_INIT
 
+#define DECLARE_STATIC_KEY_FALSE(name)	\
+	extern struct static_key_false name
+
 extern bool ____wrong_branch_error(void);
 
 #define static_key_enabled(x)							\