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 Cc: [email protected] Fixes: 3783689a1 ("zsmalloc: introduce zspage structure") Cc: [email protected] Signed-off-by: Minchan Kim <[email protected]> --- mm/zsmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index b7b1fb6c8c21..9feadf4fc3d5 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -275,7 +275,7 @@ 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; }; -- 2.7.4
