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zsmalloc: add comments for ->inuse to zspage

[akpm@linux-foundation.org: fix grammar]
Signed-off-by: Hui Zhu <zhuhui@xiaomi.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Hui Zhu 9 years ago
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      mm/zsmalloc.c

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mm/zsmalloc.c
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@@ -38,6 +38,7 @@
 
  *	page->lru: links together first pages of various zspages.
 
  *	page->lru: links together first pages of various zspages.
 
  *		Basically forming list of zspages in a fullness group.
 
  *		Basically forming list of zspages in a fullness group.
 
  *	page->mapping: class index and fullness group of the zspage
 
  *	page->mapping: class index and fullness group of the zspage
 
+ *	page->inuse: the number of objects that are used in this zspage
 
  *
 
  *
 
  * Usage of struct page flags:
 
  * Usage of struct page flags:
 
  *	PG_private: identifies the first component page
 
  *	PG_private: identifies the first component page