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| author | Peter Zijlstra | 2006-12-07 05:37:26 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2006-12-07 17:39:36 +0100 |
| commit | d5abe669172f20a4129a711de0f250a4e07db298 (patch) | |
| tree | 8a1ae8ab51525bfa9e29707f27cc656e2275b247 | |
| parent | [PATCH] ext4_ext_split(): remove dead code (diff) | |
| download | kernel-qcow2-linux-d5abe669172f20a4129a711de0f250a4e07db298.tar.gz kernel-qcow2-linux-d5abe669172f20a4129a711de0f250a4e07db298.tar.xz kernel-qcow2-linux-d5abe669172f20a4129a711de0f250a4e07db298.zip | |
[PATCH] debug: workqueue locking sanity
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>
| -rw-r--r-- | include/linux/lockdep.h | 5 | ||||
| -rw-r--r-- | kernel/workqueue.c | 13 |
2 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 819f08f1310d..da19aeb0dbe8 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -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) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 2945b094d871..5484d6e045c2 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -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); |