EDAC, mce_amd: Don't report poison bit on Fam15h, bank 4

MCA_STATUS[43] has been defined as "Poison" or "Reserved" for every bank
since Fam15h except for Fam15h, bank 4 in which case it's defined as
part of the McaStatSubCache bitfield.

Filter out that case.

Reported-by: Dean Liberty <[e-mail]>
Signed-off-by: Yazen Ghannam <[e-mail]>
Cc: Aravind Gopalakrishnan <[e-mail]>
Cc: linux-edac <[e-mail]>
Cc: x86-ml <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
[ Split an almost unparseable ternary conditional, add a comment. ]
Signed-off-by: Borislav Petkov <[e-mail]>

drivers/edac/mce_amd.c

···
 		((m->status & MCI_STATUS_PCC)	? "PCC"	  : "-"),
 		((m->status & MCI_STATUS_ADDRV)	? "AddrV" : "-"));
 
-	if (c->x86 >= 0x15)
-		pr_cont("|%s|%s",
-			((m->status & MCI_STATUS_DEFERRED) ? "Deferred" : "-"),
-			((m->status & MCI_STATUS_POISON)   ? "Poison"   : "-"));
+	if (c->x86 >= 0x15) {
+		pr_cont("|%s", (m->status & MCI_STATUS_DEFERRED ? "Deferred" : "-"));
+
+		/* F15h, bank4, bit 43 is part of McaStatSubCache. */
+		if (c->x86 != 0x15 || m->bank != 4)
+			pr_cont("|%s", (m->status & MCI_STATUS_POISON ? "Poison" : "-"));
+	}
 
 	if (boot_cpu_has(X86_FEATURE_SMCA)) {
 		u32 low, high;