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authorPeter Zijlstra <peterz@infradead.org>2019-02-26 20:19:09 +0300
committerIngo Molnar <mingo@kernel.org>2019-02-28 09:55:53 +0300
commit28d49e282665e2a51cc91b716937fccfa24d80e1 (patch)
treeb815d7101244bc6d169cb107f7fff6bf8ba53a95 /include/linux/lockdep.h
parent72dcd505e8585857397207f28782c8ba55e553b5 (diff)
downloadlinux-28d49e282665e2a51cc91b716937fccfa24d80e1.tar.xz
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@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/lockdep.h')
-rw-r--r--include/linux/lockdep.h6
1 files 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__;