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locking/lockdep: Shrink struct lock_class_key

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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>
This commit is contained in:
Peter Zijlstra 2019-02-26 18:19:09 +01:00 committed by Ingo Molnar
parent 72dcd505e8
commit 28d49e2826
1 changed files with 4 additions and 2 deletions
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6
include/linux/lockdep.h
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@ -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__;