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Commit eedeeabd authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

lockdep: add stack dumps to asserts 



Have a better idea about exactly which loc causes a lockdep
limit overflow. Often it's a bug or inefficiency in that
subsystem.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1237376327.5069.253.camel@laptop>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7f1e2ca9

kernel/lockdep.c

+5 −0
Original line number Diff line number Diff line
@@ -792,6 +792,7 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force) 


		printk("BUG: MAX_LOCKDEP_KEYS too low!\n");

		printk("turning off the locking correctness validator.\n");

		dump_stack();

		return NULL;

	}

	class = lock_classes + nr_lock_classes++;
@@ -855,6 +856,7 @@ static struct lock_list *alloc_list_entry(void) 


		printk("BUG: MAX_LOCKDEP_ENTRIES too low!\n");

		printk("turning off the locking correctness validator.\n");

		dump_stack();

		return NULL;

	}

	return list_entries + nr_list_entries++;
@@ -1681,6 +1683,7 @@ cache_hit: 


		printk("BUG: MAX_LOCKDEP_CHAINS too low!\n");

		printk("turning off the locking correctness validator.\n");

		dump_stack();

		return 0;

	}

	chain = lock_chains + nr_lock_chains++;
@@ -2540,6 +2543,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass, 
		debug_locks_off();

		printk("BUG: MAX_LOCKDEP_SUBCLASSES too low!\n");

		printk("turning off the locking correctness validator.\n");

		dump_stack();

		return 0;

	}
@@ -2636,6 +2640,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass, 
		debug_locks_off();

		printk("BUG: MAX_LOCK_DEPTH too low!\n");

		printk("turning off the locking correctness validator.\n");

		dump_stack();

		return 0;

	}