From: Guo Ren <guoren@linux.alibaba.com>
Date: Thu, 21 Jan 2021 06:31:17 +0000 (+0800)
Subject: riscv: Fixup pfn_valid error with wrong max_mapnr
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=336e8eb2a3cfe2285c314cd85630076da365f6c6;p=linux.git

riscv: Fixup pfn_valid error with wrong max_mapnr

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

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Fixes: d0d8aae64566 ("RISC-V: Set maximum number of mapped pages correctly")
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
---

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 7cd4993f4ff21..f9f9568d689ef 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -196,7 +196,7 @@ void __init setup_bootmem(void)
 	max_pfn = PFN_DOWN(dram_end);
 	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();