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Commit 76b189e9 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

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: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: default avatarNick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f648972e

include/linux/lockdep.h

+18 −0
Original line number Diff line number Diff line
@@ -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 */