diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 689ac6e9c65f..5f04a24f30ea 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -129,6 +129,14 @@
 
 #define XEC(x, mask)			(((x) >> 16) & mask)
 
+/* mce.kflags flag bits for logging etc. */
+#define	MCE_HANDLED_CEC		BIT_ULL(0)
+#define	MCE_HANDLED_UC		BIT_ULL(1)
+#define	MCE_HANDLED_EXTLOG	BIT_ULL(2)
+#define	MCE_HANDLED_NFIT	BIT_ULL(3)
+#define	MCE_HANDLED_EDAC	BIT_ULL(4)
+#define	MCE_HANDLED_MCELOG	BIT_ULL(5)
+
 /*
  * This structure contains all data related to the MCE log.  Also
  * carries a signature to make it easier to find from external
diff --git a/arch/x86/include/uapi/asm/mce.h b/arch/x86/include/uapi/asm/mce.h
index 955c2a2e1cf9..5b59d80f1d4e 100644
--- a/arch/x86/include/uapi/asm/mce.h
+++ b/arch/x86/include/uapi/asm/mce.h
@@ -35,6 +35,7 @@ struct mce {
 	__u64 ipid;		/* MCA_IPID MSR: only valid on SMCA systems */
 	__u64 ppin;		/* Protected Processor Inventory Number */
 	__u32 microcode;	/* Microcode revision */
+	__u64 kflags;		/* Internal kernel use. See below */
 };
 
 #define MCE_GET_RECORD_LEN   _IOR('M', 1, int)