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Commit 27c3b232 authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds
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[PATCH] lockdep: use chain hash on CONFIG_DEBUG_LOCKDEP too 



CONFIG_DEBUG_LOCKDEP is unacceptably slow because it does not utilize
the chain-hash. Turn the chain-hash back on in this case too.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 33e94e96

kernel/lockdep.c

+0 −8
Original line number Diff line number Diff line
@@ -1276,14 +1276,6 @@ static inline int lookup_chain_cache(u64 chain_key, struct lock_class *class) 
		if (chain->chain_key == chain_key) {

cache_hit:

			debug_atomic_inc(&chain_lookup_hits);

			/*

			 * In the debugging case, force redundant checking

			 * by returning 1:

			 */

#ifdef CONFIG_DEBUG_LOCKDEP

			__raw_spin_lock(&hash_lock);

			return 1;

#endif

			if (very_verbose(class))

				printk("\nhash chain already cached, key: %016Lx tail class: [%p] %s\n", chain_key, class->key, class->name);

			return 0;