block, cfq: remove delayed unlink

Now that all cic's are immediately unlinked from both ioc and queue,
lazy dropping from lookup path and trimming on elevator unregister are
unnecessary.  Kill them and remove now unused elevator_ops->trim().

This also leaves call_for_each_cic() without any user.  Removed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 0 insertions, 16 deletions

diff --git a/block/elevator.c b/block/elevator.c
index 66343d6917d0..6a343e8f8319 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -913,22 +913,6 @@ EXPORT_SYMBOL_GPL(elv_register);
 
 void elv_unregister(struct elevator_type *e)
 {
-        struct task_struct *g, *p;
-
-        /*
-         * Iterate every thread in the process to remove the io contexts.
-         */
-        if (e->ops.trim) {
-                read_lock(&tasklist_lock);
-                do_each_thread(g, p) {
-                        task_lock(p);
-                        if (p->io_context)
-                                e->ops.trim(p->io_context);
-                        task_unlock(p);
-                } while_each_thread(g, p);
-                read_unlock(&tasklist_lock);
-        }
-
         spin_lock(&elv_list_lock);
         list_del_init(&e->list);
         spin_unlock(&elv_list_lock);