When zspage is migrated to the other zone, the zone page state should be updated as well, otherwise the NR_ZSPAGE for each zone shows wrong counts including proc/zoneinfo in practice.

Cc: stable@vger.kernel.org [4.9+] Fixes: 91537fee0013 ("mm: add NR_ZSMALLOC to vmstat") Signed-off-by: Chanho Min chanho.min@lge.com Signed-off-by: Jinsuk Choi jjinsuk.choi@lge.com Reviewed-by: Sergey Senozhatsky sergey.senozhatsky@gmail.com Acked-by: Minchan Kim minchan@kernel.org --- mm/zsmalloc.c | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 2b2b9aa..22d17ec 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -2069,6 +2069,11 @@ static int zs_page_migrate(struct address_space *mapping, struct page *newpage, zs_pool_dec_isolated(pool); }

+ if (page_zone(newpage) != page_zone(page)) { + dec_zone_page_state(page, NR_ZSPAGES); + inc_zone_page_state(newpage, NR_ZSPAGES); + } + reset_page(page); put_page(page); page = newpage;