diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2007-10-19 10:39:55 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-19 22:53:38 +0400 |
| commit | 4e6045f134784f4b158b3c0f7a282b04bd816887 (patch) | |
| tree | 3304628f666c8524accd10f40da48cfba8b08608 /include/linux/lockdep.h | |
| parent | cf7b708c8d1d7a27736771bcf4c457b332b0f818 (diff) | |
| download | linux-4e6045f134784f4b158b3c0f7a282b04bd816887.tar.xz | |
workqueue: debug flushing deadlocks with lockdep
In the following scenario:
code path 1:
my_function() -> lock(L1); ...; flush_workqueue(); ...
code path 2:
run_workqueue() -> my_work() -> ...; lock(L1); ...
you can get a deadlock when my_work() is queued or running
but my_function() has acquired L1 already.
This patch adds a pseudo-lock to each workqueue to make lockdep
warn about this scenario.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index f6279f68a827..4c4d236ded18 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -276,6 +276,14 @@ extern void lockdep_init_map(struct lockdep_map *lock, const char *name, (lock)->dep_map.key, sub) /* + * To initialize a lockdep_map statically use this macro. + * Note that _name must not be NULL. + */ +#define STATIC_LOCKDEP_MAP_INIT(_name, _key) \ + { .name = (_name), .key = (void *)(_key), } + + +/* * Acquire a lock. * * Values for "read": |