linux-kernel - [PATCH 3.2 111/126] lockdep: Silence warning if CONFIG

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Message-ID: <lsq.1487198494.727165970@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Paul Bolle" <pebolle@...cali.nl>,
        "Stanislav Kinsbursky" <skinsbursky@...allels.com>,
        "Ingo Molnar" <mingo@...nel.org>,
        "J. Bruce Fields" <bfields@...hat.com>,
        "Peter Zijlstra" <peterz@...radead.org>
Subject: [PATCH 3.2 111/126] lockdep: Silence warning if CONFIG_LOCKDEP
 isn't set

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

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

From: Paul Bolle <pebolle@...cali.nl>

commit 5cd3f5affad2109fd1458aab3f6216f2181e26ea upstream.

Since commit c9a4962881929df7f1ef6e63e1b9da304faca4dd ("nfsd:
make client_lock per net") compiling nfs4state.o without
CONFIG_LOCKDEP set, triggers this GCC warning:

    fs/nfsd/nfs4state.c: In function ‘free_client’:
    fs/nfsd/nfs4state.c:1051:19: warning: unused variable ‘nn’ [-Wunused-variable]

The cause of that warning is that lockdep_assert_held() compiles
away if CONFIG_LOCKDEP is not set. Silence this warning by using
the argument to lockdep_assert_held() as a nop if CONFIG_LOCKDEP
is not set.

Signed-off-by: Paul Bolle <pebolle@...cali.nl>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc: J. Bruce Fields <bfields@...hat.com>
Link: http://lkml.kernel.org/r/1359060797.1325.33.camel@x61.thuisdomein
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/lockdep.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -394,7 +394,7 @@ struct lock_class_key { };
 
 #define lockdep_depth(tsk)	(0)
 
-#define lockdep_assert_held(l)			do { } while (0)
+#define lockdep_assert_held(l)			do { (void)(l); } while (0)
 #define lockdep_assert_held_once(l)		do { (void)(l); } while (0)
 
 #endif /* !LOCKDEP */