linux-kernel - [PATCH] jump_label: mark __start/stop___jump

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Date:   Thu, 9 Feb 2017 23:11:32 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jason Baron <jbaron@...mai.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Borislav Petkov <bp@...en8.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH] jump_label: mark __start/stop___jump_table const

Attempts to assign values through these pointers would fail.
Mark them const to make sure the failure is compile time.

Cc: Jason Baron <jbaron@...mai.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 include/linux/jump_label.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index a0547c5..48ed83f 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -132,8 +132,8 @@ static __always_inline bool static_key_true(struct static_key *key)
 	return !arch_static_branch(key, true);
 }
 
-extern struct jump_entry __start___jump_table[];
-extern struct jump_entry __stop___jump_table[];
+extern const struct jump_entry __start___jump_table[];
+extern const struct jump_entry __stop___jump_table[];
 
 extern void jump_label_init(void);
 extern void jump_label_lock(void);
-- 
MST