zsmalloc: zsmalloc documentation

Create zsmalloc doc which explains design concept and stat information.

Signed-off-by: Minchan Kim <[email protected]>
Cc: Juneho Choi <[email protected]>
Cc: Gunho Lee <[email protected]>
Cc: Luigi Semenzato <[email protected]>
Cc: Dan Streetman <[email protected]>
Cc: Seth Jennings <[email protected]>
Cc: Nitin Gupta <[email protected]>
Cc: Jerome Marchand <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6ee1e79..1909813 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10972,6 +10972,7 @@
 S:	Maintained
 F:	mm/zsmalloc.c
 F:	include/linux/zsmalloc.h
+F:	Documentation/vm/zsmalloc.txt
 
 ZSWAP COMPRESSED SWAP CACHING
 M:	Seth Jennings <[email protected]>