zsmalloc: expand class bit
authorMinchan Kim <minchan@kernel.org>
Thu, 13 Apr 2017 21:56:40 +0000 (14:56 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 14 Apr 2017 01:24:21 +0000 (18:24 -0700)
commit85d492f28d056c40629fc25d79f54da618a29dc4
treea1f303de42bec17df743c112c8c9337ec62bf84a
parentd72e9a7a93e4f8e9e52491921d99e0c8aa89eb4e
zsmalloc: expand class bit

Now 64K page system, zsamlloc has 257 classes so 8 class bit is not
enough.  With that, it corrupts the system when zsmalloc stores
65536byte data(ie, index number 256) so that this patch increases class
bit for simple fix for stable backport.  We should clean up this mess
soon.

  index size
  0 32
  1 288
  ..
  ..
  204 52256
  256 65536

Fixes: 3783689a1 ("zsmalloc: introduce zspage structure")
Link: http://lkml.kernel.org/r/1492042622-12074-3-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/zsmalloc.c