UBI: prepare for protection tree improvements
This patch modifies @struct ubi_wl_entry and adds union which
contains only one element so far. This is just a preparation
for further changes which will kill the protection tree and
make UBI use a list instead.
Signed-off-by: Xiaochuan-Xu <xiaochuan-xu@cqu.edu.cn>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 1c3fa18..46a4763 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -95,7 +95,7 @@
/**
* struct ubi_wl_entry - wear-leveling entry.
- * @rb: link in the corresponding RB-tree
+ * @u.rb: link in the corresponding (free/used) RB-tree
* @ec: erase counter
* @pnum: physical eraseblock number
*
@@ -104,7 +104,9 @@
* RB-trees. See WL sub-system for details.
*/
struct ubi_wl_entry {
- struct rb_node rb;
+ union {
+ struct rb_node rb;
+ } u;
int ec;
int pnum;
};