add down_write_killable_nested()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c
index c817216..2e853ad 100644
--- a/kernel/locking/rwsem.c
+++ b/kernel/locking/rwsem.c
@@ -173,6 +173,22 @@
EXPORT_SYMBOL(down_write_nested);
+int __sched down_write_killable_nested(struct rw_semaphore *sem, int subclass)
+{
+ might_sleep();
+ rwsem_acquire(&sem->dep_map, subclass, 0, _RET_IP_);
+
+ if (LOCK_CONTENDED_RETURN(sem, __down_write_trylock, __down_write_killable)) {
+ rwsem_release(&sem->dep_map, 1, _RET_IP_);
+ return -EINTR;
+ }
+
+ rwsem_set_owner(sem);
+ return 0;
+}
+
+EXPORT_SYMBOL(down_write_killable_nested);
+
void up_read_non_owner(struct rw_semaphore *sem)
{
__up_read(sem);