linux-kernel - [PATCH 1/9] mm/z3fold: fix sheduling while atomic

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Date:   Fri, 29 Apr 2022 14:40:43 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <vitaly.wool@...sulko.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH 1/9] mm/z3fold: fix sheduling while atomic

z3fold's page_lock is always held when calling alloc_slots. So gfp should
be GFP_ATOMIC to avoid "scheduling while atomic" bug.

Fixes: fc5488651c7d ("z3fold: simplify freeing slots")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/z3fold.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/z3fold.c b/mm/z3fold.c
index 83b5a3514427..c2260f5a5885 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -941,8 +941,7 @@ static inline struct z3fold_header *__z3fold_alloc(struct z3fold_pool *pool,
 	}
 
 	if (zhdr && !zhdr->slots)
-		zhdr->slots = alloc_slots(pool,
-					can_sleep ? GFP_NOIO : GFP_ATOMIC);
+		zhdr->slots = alloc_slots(pool, GFP_ATOMIC);
 	return zhdr;
 }
 
-- 
2.23.0