Commit 971b3251 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior
Browse files

lockdep: Let lock_is_held_type() detect recursive read as read

lock_is_held_type(, 1) detects acquired read locks. It only recognized
locks acquired with lock_acquire_shared(). Read locks acquired with
lock_acquire_shared_recursive() are not recognized because a `2' is
stored as the read value.

Rework the check to additionally recognise lock's read value one and two
as a read held lock.

Fixes: e9181886 ("locking: More accurate annotations for read_lock()")
Link: https://lkml.kernel.org/r/20210903084001.lblecrvz4esl4mrr@linutronix.de

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
parent bf895aa3
......@@ -5366,7 +5366,7 @@ int __lock_is_held(const struct lockdep_map *lock, int read)
struct held_lock *hlock = curr->held_locks + i;
if (match_held_lock(hlock, lock)) {
if (read == -1 || hlock->read == read)
if (read == -1 || hlock->read == !!read)
return LOCK_STATE_HELD;
return LOCK_STATE_NOT_HELD;
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment