linux-kernel - [PATCH v2 1/4] RISC-V: Add conditional macro for zone of DMA32

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Date:   Mon, 25 Jun 2018 16:49:37 +0800
From:   Zong Li <zong@...estech.com>
To:     <palmer@...ive.com>, <hch@...radead.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <zongbox@...il.com>
CC:     Zong Li <zong@...estech.com>, <greentime@...estech.com>
Subject: [PATCH v2 1/4] RISC-V: Add conditional macro for zone of DMA32

The DMA32 is for 64-bit usage.

Signed-off-by: Zong Li <zong@...estech.com>
---
 arch/riscv/mm/init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index c77df8142be2..58a522f9bcc3 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -28,7 +28,9 @@ 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));
+#endif
 	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 
 	free_area_init_nodes(max_zone_pfns);
-- 
2.16.1