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RISCV: Fix end PFN for low memory

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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@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Atish Patra 2018-09-11 11:30:18 -07:00 committed by Palmer Dabbelt
parent 17b57b1883
commit ef1f225874
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1 changed files with 1 additions and 1 deletions
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arch/riscv/kernel/setup.c
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@ -186,7 +186,7 @@ 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();