From: Peter Zijlstra Date: Wed, 10 Sep 2008 07:57:35 +0000 (+0200) Subject: lockdep: add might_lock() / might_lock_read() X-Git-Tag: v2.6.29-rc1~572^2~4^4~15 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=76b189e91845eab3a9d52bb97f971d312d25652d;p=linux-2.6-omap-h63xx.git 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 Acked-by: Nick Piggin Signed-off-by: Ingo Molnar --- diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 331e5f1c2d8..0aa657aa8a1 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 */