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[PATCH] debug: workqueue locking sanity

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Workqueue functions should not leak locks, assert so, printing the
last function ran.

Use macros in lockdep.h to avoid include dependency pains.

[akpm@osdl.org: build fix]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Peter Zijlstra 2006-12-06 20:37:26 -08:00 committed by Linus Torvalds
parent 6fb50ea79c
commit d5abe66917
2 changed files with 18 additions and 0 deletions
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5
include/linux/lockdep.h
View file

@ -243,6 +243,8 @@ extern void lock_release(struct lockdep_map *lock, int nested,
# define INIT_LOCKDEP .lockdep_recursion = 0,
#define lockdep_depth(tsk) ((tsk)->lockdep_depth)
#else /* !LOCKDEP */
static inline void lockdep_off(void)
@ -277,6 +279,9 @@ static inline int lockdep_internal(void)
* The class key takes no space if lockdep is disabled:
*/
struct lock_class_key { };
#define lockdep_depth(tsk) (0)
#endif /* !LOCKDEP */
#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS)

13
kernel/workqueue.c
View file

@ -30,6 +30,8 @@
#include <linux/hardirq.h>
#include <linux/mempolicy.h>
#include <linux/freezer.h>
#include <linux/kallsyms.h>
#include <linux/debug_locks.h>
/*
* The per-CPU workqueue (if single thread, we always use the first
@ -253,6 +255,17 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
work_release(work);
f(work);
if (unlikely(in_atomic() || lockdep_depth(current) > 0)) {
printk(KERN_ERR "BUG: workqueue leaked lock or atomic: "
"%s/0x%08x/%d\n",
current->comm, preempt_count(),
current->pid);
printk(KERN_ERR " last function: ");
print_symbol("%s\n", (unsigned long)f);
debug_show_held_locks(current);
dump_stack();
}
spin_lock_irqsave(&cwq->lock, flags);
cwq->remove_sequence++;
wake_up(&cwq->work_done);