linux-kernel - [PATCH 07/17] locking/lockdep: Introduce mark_lock

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Date:   Mon, 13 May 2019 17:11:53 +0800
From:   Yuyang Du <duyuyang@...il.com>
To:     peterz@...radead.org, will.deacon@....com, mingo@...nel.org
Cc:     bvanassche@....org, ming.lei@...hat.com, frederic@...nel.org,
        tglx@...utronix.de, boqun.feng@...il.com,
        linux-kernel@...r.kernel.org, Yuyang Du <duyuyang@...il.com>
Subject: [PATCH 07/17] locking/lockdep: Introduce mark_lock_unaccessed()

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@...il.com>
---
 kernel/locking/lockdep.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 4d96bdd..a2d5148 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -1338,6 +1338,15 @@ static inline void mark_lock_accessed(struct lock_list *lock,
 	lock->class->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 */
+	lock->class->dep_gen_id--;
+}
+
 static inline unsigned long lock_accessed(struct lock_list *lock)
 {
 	unsigned long nr;
-- 
1.8.3.1