linux-kernel - [PATCH 3.16 26/86] locking/static_keys: Provide DECLARE and well as DEFINE macros

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Date:   Thu, 16 May 2019 16:55:33 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Tony Luck" <tony.luck@...el.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Borislav Petkov" <bp@...e.de>,
        "Dan Williams" <dan.j.williams@...el.com>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: [PATCH 3.16 26/86] locking/static_keys: Provide DECLARE and well
 as DEFINE macros

3.16.68-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Tony Luck <tony.luck@...el.com>

commit b8fb03785d4de097507d0cf45873525e0ac4d2b2 upstream.

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@...el.com>
Acked-by: Borislav Petkov <bp@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/816881cf85bd3cf13385d212882618f38a3b5d33.1472754711.git.tony.luck@intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/jump_label.h | 6 ++++++
 1 file changed, 6 insertions(+)

--- 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)							\