dlm: remove kmap/kunmap

The pages used in lowcomms are not highmem, so kmap is not necessary.

Cc: Christine Caulfield <[e-mail]>
Signed-off-by: Steven Whitehouse <[e-mail]>
Signed-off-by: David Teigland <[e-mail]>

fs/dlm/lowcomms.c

···
 	len = e->len;
 	offset = e->offset;
 	spin_unlock(&con->writequeue_lock);
-	kmap(e->page);
 
 	/* Send the first block off the write queue */
 	iov[0].iov_base = page_address(e->page)+offset;
···
 
 		if (e->len == 0 && e->users == 0) {
 			list_del(&e->list);
-			kunmap(e->page);
 			free_entry(e);
 		}
 		spin_unlock(&con->writequeue_lock);
···
 
 	if (e) {
 	got_one:
-		if (users == 0)
-			kmap(e->page);
 		*ppc = page_address(e->page) + offset;
 		return e;
 	}
···
 	if (users)
 		goto out;
 	e->len = e->end - e->offset;
-	kunmap(e->page);
 	spin_unlock(&con->writequeue_lock);
 
 	if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) {
···
 		offset = e->offset;
 		BUG_ON(len == 0 && e->users == 0);
 		spin_unlock(&con->writequeue_lock);
-		kmap(e->page);
 
 		ret = 0;
 		if (len) {
···
 
 		if (e->len == 0 && e->users == 0) {
 			list_del(&e->list);
-			kunmap(e->page);
 			free_entry(e);
 			continue;
 		}