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authorIngo Molnar <mingo@elte.hu>2006-07-03 00:24:53 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:04 -0700
commit4ea2176dfa714882e88180b474e4cbcd888b70af (patch)
tree7ff3810f6b8750c226234887bb3063d91e1d71c3 /lib/rwsem.c
parenta8f24a3978c5f82419e1c90dc90460731204f46f (diff)
downloadlinux-2.6.34-ux500-4ea2176dfa714882e88180b474e4cbcd888b70af.tar.gz
[PATCH] lockdep: prove rwsem locking correctness
Use the lock validator framework to prove rwsem locking correctness. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'lib/rwsem.c')
-rw-r--r--lib/rwsem.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/rwsem.c b/lib/rwsem.c
index bae59728488..b322421c296 100644
--- a/lib/rwsem.c
+++ b/lib/rwsem.c
@@ -8,6 +8,26 @@
#include <linux/init.h>
#include <linux/module.h>
+/*
+ * Initialize an rwsem:
+ */
+void __init_rwsem(struct rw_semaphore *sem, const char *name,
+ struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ /*
+ * Make sure we are not reinitializing a held semaphore:
+ */
+ debug_check_no_locks_freed((void *)sem, sizeof(*sem));
+ lockdep_init_map(&sem->dep_map, name, key);
+#endif
+ sem->count = RWSEM_UNLOCKED_VALUE;
+ spin_lock_init(&sem->wait_lock);
+ INIT_LIST_HEAD(&sem->wait_list);
+}
+
+EXPORT_SYMBOL(__init_rwsem);
+
struct rwsem_waiter {
struct list_head list;
struct task_struct *task;