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Subject[PATCH 09/12] lockdep: Fix the way to initialize class_mutex for information of file and line
This patch adds __FILE__ and __LINE__ to arguments passed for
__mutex_init() called in __class_register().
This affects to lockdep_map of class_mutex of struct class_private,
and these will be used to make trace lock events more human friendly.

Signed-off-by: Hitoshi Mitake <>
Cc: Peter Zijlstra <>
Cc: Paul Mackerras <>
Cc: Frederic Weisbecker <>
Acked-by: Greg Kroah-Hartman <>
drivers/base/class.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 161746d..cc0630f 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -162,7 +162,8 @@ int __class_register(struct class *cls, struct lock_class_key *key)
klist_init(&cp->class_devices, klist_class_dev_get, klist_class_dev_put);
- __mutex_init(&cp->class_mutex, "struct class mutex", key);
+ __mutex_init(&cp->class_mutex, "struct class mutex", key,
+ __FILE__, __LINE__);
error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name);
if (error) {

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