linux-kernel - [PATCH] mm: add GFP_ATOMIC flag after local_lock

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Message-Id: <1625493432-9945-1-git-send-email-wangqing@vivo.com>
Date:   Mon,  5 Jul 2021 21:57:12 +0800
From:   Wang Qing <wangqing@...o.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] mm: add GFP_ATOMIC flag after local_lock_irqsave

Use GFP_ATOMIC when local_lock_irqsave in __alloc_pages_bulk

Reported-by: syzbot+e45919db2eab5e837646@...kaller.appspotmail.com
Signed-off-by: Wang Qing <wangqing@...o.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d6e94cc..3016ba5
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5309,7 +5309,7 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
 		}
 		nr_account++;
 
-		prep_new_page(page, 0, gfp, 0);
+		prep_new_page(page, 0, gfp | GFP_ATOMIC, 0);
 		if (page_list)
 			list_add(&page->lru, page_list);
 		else
-- 
2.7.4