linux-kernel - [PATCH v4 05/30] locking/lockdep: Add lock chain list_head field in struct lock_list and lock

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Date:   Thu, 29 Aug 2019 16:31:07 +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, linux-kernel@...r.kernel.org,
        longman@...hat.com, paulmck@...ux.vnet.ibm.com,
        boqun.feng@...il.com, Yuyang Du <duyuyang@...il.com>
Subject: [PATCH v4 05/30] locking/lockdep: Add lock chain list_head field in struct lock_list and lock_chain

A direct lock dependency, such as L1 -> L2, can be in different lock chains
having that lock dependency. In order for us to associate lock chains to
lock dependencies, we add some new fields in struct lock_list and
lock_chain.

No functional change.

Signed-off-by: Yuyang Du <duyuyang@...il.com>
---
 include/linux/lockdep.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index b8a835f..d7bec61 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -188,6 +188,7 @@ static inline void lockdep_copy_map(struct lockdep_map *to,
  */
 struct lock_list {
 	struct list_head		entry;
+	struct list_head		chains;
 	struct lock_class		*class;
 	struct lock_class		*links_to;
 	const struct lock_trace		*trace;
@@ -207,6 +208,7 @@ struct lock_list {
  * @depth:       the number of held locks in this chain
  * @base:        the index in chain_hlocks for this chain
  * @entry:       the collided lock chains in lock_chain hash list
+ * @chain_entry: the link to the next lock_chain in the same dependency
  * @chain_key:   the hash key of this lock_chain
  */
 struct lock_chain {
@@ -216,6 +218,7 @@ struct lock_chain {
 					base	    : 24;
 	/* 4 byte hole */
 	struct hlist_node		entry;
+	struct list_head		chain_entry;
 	u64				chain_key;
 };
 
-- 
1.8.3.1