[PATCH] lockdep: improve debug output
Make lockdep print which lock is held, in the "kfree() of a live lock" scenario. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -2551,7 +2551,7 @@ static inline int in_range(const void *start, const void *addr, const void *end)
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static void
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print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
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const void *mem_to)
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const void *mem_to, struct held_lock *hlock)
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{
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if (!debug_locks_off())
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return;
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@ -2563,6 +2563,7 @@ print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
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printk( "-------------------------\n");
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printk("%s/%d is freeing memory %p-%p, with a lock still held there!\n",
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curr->comm, curr->pid, mem_from, mem_to-1);
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print_lock(hlock);
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lockdep_print_held_locks(curr);
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printk("\nstack backtrace:\n");
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@ -2596,7 +2597,7 @@ void debug_check_no_locks_freed(const void *mem_from, unsigned long mem_len)
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!in_range(mem_from, lock_to, mem_to))
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continue;
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print_freed_lock_bug(curr, mem_from, mem_to);
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print_freed_lock_bug(curr, mem_from, mem_to, hlock);
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break;
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}
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local_irq_restore(flags);
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