linux-kernel - [PATCH] debugobjects: avoid another unused variable warning.

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Message-Id: <20180313131857.158876-1-arnd@arndb.de>
Date:   Tue, 13 Mar 2018 14:18:46 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Waiman Long <longman@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] debugobjects: avoid another unused variable warning.

debug_objects_maxchecked is only updated in __debug_check_no_obj_freed(),
and only read in debug_objects_maxchecked, unfortunately both of
these are optional and depend on different Kconfig symbols. When both
CONFIG_DEBUG_OBJECTS_FREE and CONFIG_DEBUG_FS are disabled, we get
this warning:

lib/debugobjects.c:56:14: error: 'debug_objects_maxchecked' defined but not used [-Werror=unused-variable]

Rather than trying to add more complex #ifdef protections, this marks
the variable as __maybe_unused so it can be silently dropped when
usused.

Fixes: bd9dcd046509 ("debugobjects: Export max loops counter")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 lib/debugobjects.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 105ecfc47d8c..994be4805cec 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -53,7 +53,7 @@ static int			obj_nr_tofree;
 static struct kmem_cache	*obj_cache;
 
 static int			debug_objects_maxchain __read_mostly;
-static int			debug_objects_maxchecked __read_mostly;
+static int __maybe_unused	debug_objects_maxchecked __read_mostly;
 static int			debug_objects_fixups __read_mostly;
 static int			debug_objects_warnings __read_mostly;
 static int			debug_objects_enabled __read_mostly
-- 
2.9.0