From 9a6630aef93394ac54494c7e273e9bc026509375 Mon Sep 17 00:00:00 2001
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Date: Mon, 11 May 2020 10:19:59 +0800
Subject: [PATCH] riscv: pgtable: Fix __kernel_map_pages build error if NOMMU

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 <hulkci@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.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 f225e2fbdfb4..35b60035b6b0 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 TASK_SIZE 0xffffffffUL
 
+static inline void __kernel_map_pages(struct page *page, int numpages, int enable) {}
+
 #endif /* !CONFIG_MMU */
 
 #define kern_addr_valid(addr)   (1) /* FIXME */
-- 
2.30.9