[PATCH] powerpc: Don't use generic machine check parsing everywhere

[Olof Johansson <olof@lixom.net>]

If a platform provide it's own machine check handler, assume that code
will handle the reason parsing and reporting the error. The current
default fall-though only makes sense on a few 32-bit platforms that
lack individual handlers.
    
Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index ccfc99d..ce1aafc 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -440,34 +440,36 @@ void machine_check_exception(struct pt_regs *regs)
 	if (reason & MCSR_BUS_WRERR)
 		printk("Bus - Write Bus Error on buffered store or cache line push\n");
 #else /* !CONFIG_4xx && !CONFIG_E500 && !CONFIG_E200 */
-	printk("Machine check in kernel mode.\n");
-	printk("Caused by (from SRR1=%lx): ", reason);
-	switch (reason & 0x601F0000) {
-	case 0x80000:
-		printk("Machine check signal\n");
-		break;
-	case 0:		/* for 601 */
-	case 0x40000:
-	case 0x140000:	/* 7450 MSS error and TEA */
-		printk("Transfer error ack signal\n");
-		break;
-	case 0x20000:
-		printk("Data parity error signal\n");
-		break;
-	case 0x10000:
-		printk("Address parity error signal\n");
-		break;
-	case 0x20000000:
-		printk("L1 Data Cache error\n");
-		break;
-	case 0x40000000:
-		printk("L1 Instruction Cache error\n");
-		break;
-	case 0x00100000:
-		printk("L2 data cache parity error\n");
-		break;
-	default:
-		printk("Unknown values in msr\n");
+	if (!ppc_md.machine_check_exception) {
+		printk("Machine check in kernel mode.\n");
+		printk("Caused by (from SRR1=%lx): ", reason);
+		switch (reason & 0x601F0000) {
+		case 0x80000:
+			printk("Machine check signal\n");
+			break;
+		case 0:		/* for 601 */
+		case 0x40000:
+		case 0x140000:	/* 7450 MSS error and TEA */
+			printk("Transfer error ack signal\n");
+			break;
+		case 0x20000:
+			printk("Data parity error signal\n");
+			break;
+		case 0x10000:
+			printk("Address parity error signal\n");
+			break;
+		case 0x20000000:
+			printk("L1 Data Cache error\n");
+			break;
+		case 0x40000000:
+			printk("L1 Instruction Cache error\n");
+			break;
+		case 0x00100000:
+			printk("L2 data cache parity error\n");
+			break;
+		default:
+			printk("Unknown values in msr\n");
+		}
 	}
 #endif /* CONFIG_4xx */