[PATCH 1/5] RISC-V: Add conditional macro for zone of DMA32

[Zong Li]

The DMA32 is for 64-bit usage.

Signed-off-by: Zong Li <z...@andestech.com>
---
 arch/riscv/mm/init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index c77df8142be2..91a5852e28fd 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -28,8 +28,11 @@ static void __init zone_sizes_init(void)
 {
        unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
 
+#ifdef CONFIG_ZONE_DMA32
        max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, max_low_pfn));
+#else
        max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+#endif
 
        free_area_init_nodes(max_zone_pfns);
 }
-- 
2.16.1