1 files changed, 1 insertions, 0 deletions

diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h
index f64949fae61a..78427021d94a 100644
--- a/include/asm-x86_64/proto.h
+++ b/include/asm-x86_64/proto.h
@@ -92,6 +92,7 @@ extern unsigned long table_start, table_end;
 
 extern int exception_trace;
 extern unsigned cpu_khz;
+extern unsigned tsc_khz;
 
 extern void no_iommu_init(void);
 extern int force_iommu, no_iommu;