From: zhangchun <zhang.chuna@h3c.com>
To: <akpm@linux-foundation.org>
Cc: <linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
<jiaoxupo@h3c.com>, <shaohaojize@126.com>, <zhang.chuna@h3c.com>
Subject: [PATCH] use might_sleep check if kmap_high is called from atomic context
Date: Tue, 20 Aug 2024 09:53:11 +0800 [thread overview]
Message-ID: <1724118791-51554-1-git-send-email-zhang.chuna@h3c.com> (raw)
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@h3c.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
next reply other threads:[~2024-08-20 1:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-20 1:53 zhangchun [this message]
2024-08-20 3:24 ` Matthew Wilcox
2024-08-20 6:33 ` zhangchun
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