From: Miaohe Lin Date: Fri, 29 Apr 2022 06:40:43 +0000 (+0800) Subject: mm/z3fold: fix sheduling while atomic X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4c6bdb36408fbe4697eb9f1d95a3ddc1d2348448;p=linux.git mm/z3fold: fix sheduling while atomic Patch series "A few fixup patches for z3fold". This series contains a few fixup patches to fix sheduling while atomic, fix possible null pointer dereferencing, fix various race conditions and so on. More details can be found in the respective changelogs. This patch (of 9): z3fold's page_lock is always held when calling alloc_slots. So gfp should be GFP_ATOMIC to avoid "scheduling while atomic" bug. Link: https://lkml.kernel.org/r/20220429064051.61552-1-linmiaohe@huawei.com Link: https://lkml.kernel.org/r/20220429064051.61552-2-linmiaohe@huawei.com Fixes: fc5488651c7d ("z3fold: simplify freeing slots") Signed-off-by: Miaohe Lin Reviewed-by: Vitaly Wool Signed-off-by: Andrew Morton --- diff --git a/mm/z3fold.c b/mm/z3fold.c index 83b5a3514427e..c2260f5a58857 100644 --- a/mm/z3fold.c +++ b/mm/z3fold.c @@ -941,8 +941,7 @@ lookup: } if (zhdr && !zhdr->slots) - zhdr->slots = alloc_slots(pool, - can_sleep ? GFP_NOIO : GFP_ATOMIC); + zhdr->slots = alloc_slots(pool, GFP_ATOMIC); return zhdr; }