Thank you for your reminder. I have changed the place where the header
file was imported again.

Signed-off-by: Junjie Fu <fujunjie1@qq.com>
---
 mm/mempolicy.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 88eef9776bb0..9ee22263591d 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -109,6 +109,7 @@
 #include <linux/mmu_notifier.h>
 #include <linux/printk.h>
 #include <linux/swapops.h>
+#include <linux/pagemap.h>
 
 #include <asm/tlbflush.h>
 #include <asm/tlb.h>
-- 
2.34.1