x86/RAS: Remove mce.usable_addr

It is useless and we can use the function instead. Besides,
mcelog(8) hasn't managed to make use of it yet. So kill it.

Signed-off-by: Borislav Petkov <[e-mail]>
Acked-by: Tony Luck <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Brian Gerst <[e-mail]>
Cc: Denys Vlasenko <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/include/uapi/asm/mce.h

···
 	__u8  cpuvendor;	/* cpu vendor as encoded in system.h */
 	__u8  inject_flags;	/* software inject flags */
 	__u8  severity;
-	__u8  usable_addr;
+	__u8  pad;
 	__u32 cpuid;	/* CPUID 1 EAX */
 	__u8  cs;		/* code segment */
 	__u8  bank;	/* machine check bank */

arch/x86/kernel/cpu/mcheck/mce.c

···
 	if (!mce)
 		return NOTIFY_DONE;
 
-	if (mce->usable_addr && (mce->severity == MCE_AO_SEVERITY)) {
+	if (mce_usable_address(mce) && (mce->severity == MCE_AO_SEVERITY)) {
 		pfn = mce->addr >> PAGE_SHIFT;
 		memory_failure(pfn, MCE_VECTOR, 0);
 	}
···
 
 		severity = mce_severity(&m, mca_cfg.tolerant, NULL, false);
 
-		if (severity == MCE_DEFERRED_SEVERITY && memory_error(&m)) {
-			if (m.status & MCI_STATUS_ADDRV) {
+		if (severity == MCE_DEFERRED_SEVERITY && memory_error(&m))
+			if (m.status & MCI_STATUS_ADDRV)
 				m.severity = severity;
-				m.usable_addr = mce_usable_address(&m);
-			}
-		}
 
 		/*
 		 * Don't get the IP here because it's unlikely to
···
 		 */
 		if (!(flags & MCP_DONTLOG) && !mca_cfg.dont_log_ce)
 			mce_log(&m);
-		else if (m.usable_addr) {
+		else if (mce_usable_address(&m)) {
 			/*
 			 * Although we skipped logging this, we still want
 			 * to take action. Add to the pool so the registered
···
 
 		/* assuming valid severity level != 0 */
 		m.severity = severity;
-		m.usable_addr = mce_usable_address(&m);
 
 		mce_log(&m);