diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-09-10 09:57:35 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-10 13:48:49 +0200 |
| commit | 76b189e91845eab3a9d52bb97f971d312d25652d (patch) | |
| tree | 4ce5a577fc58e055febc942987eea8853f54c7a7 /include/linux/lockdep.h | |
| parent | f648972e017659c741bdd3be6b4aeb2d73672031 (diff) | |
| download | lwn-76b189e91845eab3a9d52bb97f971d312d25652d.tar.gz lwn-76b189e91845eab3a9d52bb97f971d312d25652d.zip | |
lockdep: add might_lock() / might_lock_read()
useful to establish a lock dependency in case the actual dependency is
rare or hard to trigger.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 331e5f1c2d8e..0aa657aa8a1e 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -480,4 +480,22 @@ static inline void print_irqtrace_events(struct task_struct *curr) # define lock_map_release(l) do { } while (0) #endif +#ifdef CONFIG_PROVE_LOCKING +# define might_lock(lock) \ +do { \ + typecheck(struct lockdep_map *, &(lock)->dep_map); \ + lock_acquire(&(lock)->dep_map, 0, 0, 0, 2, NULL, _THIS_IP_); \ + lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ +} while (0) +# define might_lock_read(lock) \ +do { \ + typecheck(struct lockdep_map *, &(lock)->dep_map); \ + lock_acquire(&(lock)->dep_map, 0, 0, 1, 2, NULL, _THIS_IP_); \ + lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ +} while (0) +#else +# define might_lock(lock) do { } while (0) +# define might_lock_read(lock) do { } while (0) +#endif + #endif /* __LINUX_LOCKDEP_H */ |