[PATCH] use might_sleep check if kmap_high is called from atomic context
From: zhangchun
Date: Mon Aug 19 2024 - 21:53:00 EST
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@xxxxxxx>
---
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