diff --git a/include/linux/bio.h b/include/linux/bio.h
index 4d85262b4fa4e8a4e9eb984e668f57363fd09183..1ddef34f43c37c3a4153e080fa1c97757fe1ab08 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -24,6 +24,8 @@
 #include <linux/mempool.h>
 #include <linux/ioprio.h>
 
+#ifdef CONFIG_BLOCK
+
 /* Platforms may set this to teach the BIO layer about IOMMU hardware. */
 #include <asm/io.h>
 
@@ -361,4 +363,5 @@ static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx,
 	__bio_kmap_irq((bio), (bio)->bi_idx, (flags))
 #define bio_kunmap_irq(buf,flags)	__bio_kunmap_irq(buf, flags)
 
+#endif /* CONFIG_BLOCK */
 #endif /* __LINUX_BIO_H */