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-rw-r--r--arch/x86/include/asm/io.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 1dbbdf4be9b..76797f4783b 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -105,5 +105,6 @@ extern void __iomem *early_memremap(unsigned long offset, unsigned long size);
extern void early_iounmap(void __iomem *addr, unsigned long size);
extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
+#define IO_SPACE_LIMIT 0xffff
#endif /* _ASM_X86_IO_H */