block: remove the second argument of k[un]map_atomic()

Signed-off-by: Cong Wang <amwang@redhat.com>
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index cd50435..bbca966 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -93,16 +93,16 @@
 			 struct page *loop_page, unsigned loop_off,
 			 int size, sector_t real_block)
 {
-	char *raw_buf = kmap_atomic(raw_page, KM_USER0) + raw_off;
-	char *loop_buf = kmap_atomic(loop_page, KM_USER1) + loop_off;
+	char *raw_buf = kmap_atomic(raw_page) + raw_off;
+	char *loop_buf = kmap_atomic(loop_page) + loop_off;
 
 	if (cmd == READ)
 		memcpy(loop_buf, raw_buf, size);
 	else
 		memcpy(raw_buf, loop_buf, size);
 
-	kunmap_atomic(loop_buf, KM_USER1);
-	kunmap_atomic(raw_buf, KM_USER0);
+	kunmap_atomic(loop_buf);
+	kunmap_atomic(raw_buf);
 	cond_resched();
 	return 0;
 }
@@ -112,8 +112,8 @@
 			struct page *loop_page, unsigned loop_off,
 			int size, sector_t real_block)
 {
-	char *raw_buf = kmap_atomic(raw_page, KM_USER0) + raw_off;
-	char *loop_buf = kmap_atomic(loop_page, KM_USER1) + loop_off;
+	char *raw_buf = kmap_atomic(raw_page) + raw_off;
+	char *loop_buf = kmap_atomic(loop_page) + loop_off;
 	char *in, *out, *key;
 	int i, keysize;
 
@@ -130,8 +130,8 @@
 	for (i = 0; i < size; i++)
 		*out++ = *in++ ^ key[(i & 511) % keysize];
 
-	kunmap_atomic(loop_buf, KM_USER1);
-	kunmap_atomic(raw_buf, KM_USER0);
+	kunmap_atomic(loop_buf);
+	kunmap_atomic(raw_buf);
 	cond_resched();
 	return 0;
 }