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-rw-r--r--arch/nds32/include/asm/io.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/nds32/include/asm/io.h b/arch/nds32/include/asm/io.h
index 966e71b3c960..71cd226d6863 100644
--- a/arch/nds32/include/asm/io.h
+++ b/arch/nds32/include/asm/io.h
@@ -4,6 +4,8 @@
#ifndef __ASM_NDS32_IO_H
#define __ASM_NDS32_IO_H
+#include <linux/types.h>
+
extern void iounmap(volatile void __iomem *addr);
#define __raw_writeb __raw_writeb
static inline void __raw_writeb(u8 val, volatile void __iomem *addr)