mm/zsmalloc.c: fix comment for get_pages_per_zspage

Yinghao Xie · torvalds · commit 888fa374e625 · 2015-04-15T16:35:21.000-07:00
Signed-off-by: Yinghao Xie &lt;yinghao.xie@sumsung.com&gt;
Suggested-by: Minchan Kim &lt;minchan@kernel.org&gt;
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
@@ -731,7 +731,8 @@ static enum fullness_group fix_fullness_group(struct size_class *class,
  * to form a zspage for each size class. This is important
  * to reduce wastage due to unusable space left at end of
  * each zspage which is given as:
- *	wastage = Zp - Zp % size_class
+ *     wastage = Zp % class_size
+ *     usage = Zp - wastage
  * where Zp = zspage size = k * PAGE_SIZE where k = 1, 2, ...
  *
  * For example, for size class of 3/8 * PAGE_SIZE, we should
