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 <[email protected]> --- 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
