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authorIngo Molnar <mingo@elte.hu>2006-07-03 00:25:07 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:07 -0700
commiteb4542b98c81e22e08587b747b21986a45360999 (patch)
treee983cc095333c11bed51950ed39ad3a51d140398
parent243c7621aac4ed1aa79524c9a1cecf7c05a28124 (diff)
[PATCH] lockdep: annotate waitqueues
Create one lock class for all waitqueue locks in the kernel. Has no effect on non-lockdep kernels. 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>
-rw-r--r--include/linux/wait.h6
-rw-r--r--kernel/wait.c4
2 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/wait.h b/include/linux/wait.h
index bc4f389c49bb..794be7af58ae 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -77,9 +77,15 @@ struct task_struct;
#define __WAIT_BIT_KEY_INITIALIZER(word, bit) \
{ .flags = word, .bit_nr = bit, }
+/*
+ * lockdep: we want one lock-class for all waitqueue locks.
+ */
+extern struct lock_class_key waitqueue_lock_key;
+
static inline void init_waitqueue_head(wait_queue_head_t *q)
{
spin_lock_init(&q->lock);
+ lockdep_set_class(&q->lock, &waitqueue_lock_key);
INIT_LIST_HEAD(&q->task_list);
}
diff --git a/kernel/wait.c b/kernel/wait.c
index 5985d866531f..a1d57aeb7f75 100644
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -10,6 +10,10 @@
#include <linux/wait.h>
#include <linux/hash.h>
+struct lock_class_key waitqueue_lock_key;
+
+EXPORT_SYMBOL(waitqueue_lock_key);
+
void fastcall add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait)
{
unsigned long flags;