linux-kernel - [PATCH] livepatch: make klp

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Date:   Wed, 8 Mar 2017 10:16:00 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>, Jessica Yu <jeyu@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com>
cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] livepatch: make klp_mutex proper part of API

From: Jiri Kosina <jkosina@...e.cz>

klp_mutex is shared between core.c and transition.c, and as such would 
rather be properly located in livepatch.h so that we don't have to play 
'extern' games from .c sources.

This also silences sparse warning (wrongly) suggesting that klp_mutex 
should be defined static.

Signed-off-by: Jiri Kosina <jkosina@...e.cz>
---
 include/linux/livepatch.h     | 2 ++
 kernel/livepatch/transition.c | 2 --
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index 194991ef9347..4efa89f95dd7 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -138,6 +138,8 @@ struct klp_patch {
 	     func->old_name || func->new_func || func->old_sympos; \
 	     func++)
 
+extern struct mutex klp_mutex;
+
 int klp_register_patch(struct klp_patch *);
 int klp_unregister_patch(struct klp_patch *);
 int klp_enable_patch(struct klp_patch *);
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index 0ab7abd53b0b..14f7ce64b002 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -28,8 +28,6 @@
 #define MAX_STACK_ENTRIES  100
 #define STACK_ERR_BUF_SIZE 128
 
-extern struct mutex klp_mutex;
-
 struct klp_patch *klp_transition_patch;
 
 static int klp_target_state = KLP_UNDEFINED;
-- 
2.11.0