[PATCH v3 24/30] locking/lockdep: Introduce mark_lock_unaccessed()

Yuyang Du
2019-06-28T09:17:34Z

Since in graph search, multiple matches may be needed, a matched lock
needs to rejoin the search for another match, thereby introduce
mark_lock_unaccessed().

Signed-off-by: Yuyang Du <duyuyang@gmail.com>
---
kernel/locking/lockdep.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 444eb62..e7610d2 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -1449,6 +1449,15 @@ static inline void mark_lock_accessed(struct lock_list *lock,
lock->class[forward]->dep_gen_id = lockdep_dependency_gen_id;
}

+static inline void mark_lock_unaccessed(struct lock_list *lock)
+{
+ unsigned long nr;
+
+ nr = lock - list_entries;
+ WARN_ON(nr >= ARRAY_SIZE(list_entries)); /* Out-of-bounds, input fail */
+ fw_dep_class(lock)->dep_gen_id--;
+}
+
static inline unsigned long lock_accessed(struct lock_list *lock, int forward)
{
unsigned long nr;
--
1.8.3.1