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Subject[tip:core/debugobjects] debugobjects: Avoid another unused variable warning
Commit-ID:  163cf842f5837334bc69aaf09ad38e11f4573914
Author: Arnd Bergmann <>
AuthorDate: Tue, 13 Mar 2018 14:18:46 +0100
Committer: Thomas Gleixner <>
CommitDate: Wed, 14 Mar 2018 20:20:01 +0100

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 this
warning is emitted:

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, mark 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 <>
Signed-off-by: Thomas Gleixner <>
Acked-by: Yang Shi <>
Cc: Waiman Long <>

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
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