riscv64-none-linux-gnu-ld: mm/page_alloc.o: in function `.L0 ':
page_alloc.c:(.text+0xd34): undefined reference to `__kernel_map_pages'
riscv64-none-linux-gnu-ld: page_alloc.c:(.text+0x104a): undefined reference to 
`__kernel_map_pages'
riscv64-none-linux-gnu-ld: mm/page_alloc.o: in function 
`__pageblock_pfn_to_page':
page_alloc.c:(.text+0x145e): undefined reference to `__kernel_map_pages'

Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.w...@huawei.com>
---
 arch/riscv/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index a12d343e080a..d50706ea1c94 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -477,6 +477,8 @@ static inline int ptep_clear_flush_young(struct 
vm_area_struct *vma,
 #define VMALLOC_START          0
 #define VMALLOC_END            TASK_SIZE
 
+static inline void __kernel_map_pages(struct page *page, int numpages, int 
enable) {}
+
 #endif /* !CONFIG_MMU */
 
 #define kern_addr_valid(addr)   (1) /* FIXME */
-- 
2.26.2

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