This is a note to let you know that I've just added the patch titled
lockdep: Add a missing initialization hint to the "INFO: Trying to register non-static key" message
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
lockdep-add-a-missing-initialization-hint-to-the-inf.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit efcd0d0503ec0a8609bd0d2f00dd4eeb5d915493
Author: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Date: Sun Mar 21 15:49:13 2021 +0900
lockdep: Add a missing initialization hint to the "INFO: Trying to register non-static key" message
[ Upstream commit 3a85969e9d912d5dd85362ee37b5f81266e00e77 ]
Since this message is printed when dynamically allocated spinlocks (e.g.
kzalloc()) are used without initialization (e.g. spin_lock_init()),
suggest to developers to check whether initialization functions for objects
were called, before making developers wonder what annotation is missing.
[ mingo: Minor tweaks to the message. ]
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210321064913.4619-1-penguin-kernel@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 8a1758b094b7..126c6d524a0f 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -722,7 +722,8 @@ static bool assign_lock_key(struct lockdep_map *lock)
/* Debug-check: all keys must be persistent! */
debug_locks_off();
pr_err("INFO: trying to register non-static key.\n");
- pr_err("the code is fine but needs lockdep annotation.\n");
+ pr_err("The code is fine but needs lockdep annotation, or maybe\n");
+ pr_err("you didn't initialize this object before use?\n");
pr_err("turning off the locking correctness validator.\n");
dump_stack();
return false;
