[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <1724118791-51554-1-git-send-email-zhang.chuna@h3c.com>
Date: Tue, 20 Aug 2024 09:53:11 +0800
From: zhangchun <zhang.chuna@....com>
To: <akpm@...ux-foundation.org>
CC: <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>, <jiaoxupo@....com>,
<shaohaojize@....com>, <zhang.chuna@....com>
Subject: [PATCH] use might_sleep check if kmap_high is called from atomic context
kmap_high is defined as EXPORT_SYMBOL, and cannot be called from atomic
context. Add might_sleep check is necessary.
Signed-off-by: zhangchun <zhang.chuna@....com>
---
mm/highmem.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/mm/highmem.c b/mm/highmem.c
index 07f2c67..5cfb5a9 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -319,6 +319,11 @@ void *kmap_high(struct page *page)
unsigned long vaddr;
/*
+ * Use might_sleep to check if kmap_high is called
+ * from atomic context.
+ */
+ might_sleep();
+ /*
* For highmem pages, we can't trust "virtual" until
* after we have the lock.
*/
--
1.8.3.1
Powered by blists - more mailing lists