linux-kernel - [PATCH 2/5] RISC-V: Use swiotlb on RV64 only

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Message-Id: <b9b943c21725db9822a787a1e985010012fc33b2.1537260207.git.zongbox@gmail.com>
Date:   Tue, 18 Sep 2018 17:19:14 +0800
From:   Zong Li <zongbox@...il.com>
To:     palmer@...ive.com, aou@...s.berkeley.edu
Cc:     vincentc@...estech.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, zong@...estech.com,
        Zong Li <zongbox@...il.com>
Subject: [PATCH 2/5] RISC-V: Use swiotlb on RV64 only

Only RV64 supports swiotlb.

Signed-off-by: Zong Li <zong@...estech.com>
---
 arch/riscv/kernel/setup.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index aee6031..872a280 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -227,7 +227,10 @@ void __init setup_arch(char **cmdline_p)
 	setup_bootmem();
 	paging_init();
 	unflatten_device_tree();
+
+#ifdef CONFIG_64bit
 	swiotlb_init(1);
+#endif
 
 #ifdef CONFIG_SMP
 	setup_smp();
-- 
2.7.4