1 files changed, 11 insertions, 2 deletions

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 29e3093bbd21..aa97342e7ca0 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -32,11 +32,20 @@
 #define MCI_STATUS_PCC   (1ULL<<57)  /* processor context corrupt */
 #define MCI_STATUS_S     (1ULL<<56)  /* Signaled machine check */
 #define MCI_STATUS_AR    (1ULL<<55)  /* Action required */
-#define MCACOD            0xffff     /* MCA Error Code */
+
+/*
+ * Note that the full MCACOD field of IA32_MCi_STATUS MSR is
+ * bits 15:0.  But bit 12 is the 'F' bit, defined for corrected
+ * errors to indicate that errors are being filtered by hardware.
+ * We should mask out bit 12 when looking for specific signatures
+ * of uncorrected errors - so the F bit is deliberately skipped
+ * in this #define.
+ */
+#define MCACOD            0xefff     /* MCA Error Code */
 
 /* Architecturally defined codes from SDM Vol. 3B Chapter 15 */
 #define MCACOD_SCRUB    0x00C0  /* 0xC0-0xCF Memory Scrubbing */
-#define MCACOD_SCRUBMSK 0xfff0
+#define MCACOD_SCRUBMSK 0xeff0  /* Skip bit 12 ('F' bit) */
 #define MCACOD_L3WB     0x017A  /* L3 Explicit Writeback */
 #define MCACOD_DATA     0x0134  /* Data Load */
 #define MCACOD_INSTR    0x0150  /* Instruction Fetch */