linux-kernel - [PATCH AUTOSEL 4.18 075/100] RISCV: Fix end PFN for low memory

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Date:   Tue, 16 Oct 2018 00:11:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.18 075/100] RISCV: Fix end PFN for low memory

From: Atish Patra <atish.patra@....com>

[ Upstream commit ef1f2258748b675422ca0107e5bfb9ceeac675de ]

Use memblock_end_of_DRAM which provides correct last low memory
PFN. Without that, DMA32 region becomes empty resulting in zero
pages being allocated for DMA32.

This patch is based on earlier patch from palmer which never
merged into 4.19. I just edited the commit text to make more
sense.

Signed-off-by: Atish Patra <atish.patra@....com>
Signed-off-by: Palmer Dabbelt <palmer@...ive.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/riscv/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 0efa5b29d0a3..dcff272aee06 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -165,7 +165,7 @@ static void __init setup_bootmem(void)
 	BUG_ON(mem_size == 0);
 
 	set_max_mapnr(PFN_DOWN(mem_size));
-	max_low_pfn = pfn_base + PFN_DOWN(mem_size);
+	max_low_pfn = memblock_end_of_DRAM();
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	setup_initrd();
-- 
2.17.1