diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 3d6606f..4b11974 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -119,6 +119,7 @@
 #define X86_FEATURE_TM2		( 4*32+ 8) /* Thermal Monitor 2 */
 #define X86_FEATURE_SSSE3	( 4*32+ 9) /* Supplemental SSE-3 */
 #define X86_FEATURE_CID		( 4*32+10) /* Context ID */
+#define X86_FEATURE_SDBG	( 4*32+11) /* Silicon Debug */
 #define X86_FEATURE_FMA		( 4*32+12) /* Fused multiply-add */
 #define X86_FEATURE_CX16	( 4*32+13) /* CMPXCHG16B */
 #define X86_FEATURE_XTPR	( 4*32+14) /* Send Task Priority Messages */