From eedeeabdeeadb016b8c783e3620d06b98d0cb4e1 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Wed, 18 Mar 2009 12:38:47 +0100 Subject: [PATCH] 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: Peter Zijlstra LKML-Reference: <1237376327.5069.253.camel@laptop> Signed-off-by: Ingo Molnar --- kernel/lockdep.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 981cd485428..a288ae107b5 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -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; } -- 2.41.1