Commit-ID: 28d49e282665e2a51cc91b716937fccfa24d80e1
Gitweb: https://git.kernel.org/tip/28d49e282665e2a51cc91b716937fccfa24d80e1
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Tue, 26 Feb 2019 18:19:09 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 28 Feb 2019 07:55:53 +0100
locking/lockdep: Shrink struct lock_class_key
Shrink struct lock_class_key; we never store anything in subkeys[], we
only use the addresses.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
include/linux/lockdep.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 43fb35bd7baf..79c3873d58ac 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -58,8 +58,10 @@ struct lockdep_subclass_key {
/* hash_entry is used to keep track of dynamically allocated keys. */
struct lock_class_key {
- struct hlist_node hash_entry;
- struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
+ union {
+ struct hlist_node hash_entry;
+ struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
+ };
};
extern struct lock_class_key __lockdep_no_validate__;
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