1 files changed, 2 insertions, 0 deletions

diff --git a/include/asm-x86/io.h b/include/asm-x86/io.h
index bf5d629b3a39..a145210ac16b 100644
--- a/include/asm-x86/io.h
+++ b/include/asm-x86/io.h
@@ -73,6 +73,8 @@ build_mmio_write(__writeq, "q", unsigned long, "r", )
 #define writeq writeq
 #endif
 
+extern int iommu_bio_merge;
+
 #ifdef CONFIG_X86_32
 # include "io_32.h"
 #else