[PATCH] riscv: Fixup pfn_valid error with wrong max_mapnr

[guoren]

From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

The max_mapnr is the number of PFNs, not absolute PFN offset.

Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
Cc: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx>
---
 arch/riscv/mm/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index bf5379135e39..1576ee9e5e94 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -184,7 +184,7 @@ void __init setup_bootmem(void)
 	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
 	max_low_pfn = max_pfn;
 	dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
-	set_max_mapnr(max_low_pfn);
+	set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	setup_initrd();
-- 
2.17.1