Commit 85d492f2 authored by Minchan Kim's avatar Minchan Kim Committed by Linus Torvalds
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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

  index	size
  0	32
  1	288
  204	52256
  256	65536

Fixes: 3783689a ("zsmalloc: introduce zspage structure")

Signed-off-by: default avatarMinchan Kim <>
Cc: Sergey Senozhatsky <>
Cc: <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent d72e9a7a
......@@ -276,7 +276,7 @@ struct zs_pool {
struct zspage {
struct {
unsigned int fullness:FULLNESS_BITS;
unsigned int class:CLASS_BITS;
unsigned int class:CLASS_BITS + 1;
unsigned int isolated:ISOLATED_BITS;
unsigned int magic:MAGIC_VAL_BITS;
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