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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-09-10 09:57:35 +0200
committerIngo Molnar <mingo@elte.hu>2008-09-10 13:48:49 +0200
commit76b189e91845eab3a9d52bb97f971d312d25652d (patch)
tree4ce5a577fc58e055febc942987eea8853f54c7a7 /include/linux/lockdep.h
parentf648972e017659c741bdd3be6b4aeb2d73672031 (diff)
downloadop-kernel-dev-76b189e91845eab3a9d52bb97f971d312d25652d.zip
op-kernel-dev-76b189e91845eab3a9d52bb97f971d312d25652d.tar.gz
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.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 331e5f1..0aa657a 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 */
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