amd64_edac: Do not falsely trigger kerneloops

An unfortunate "WARNING" in the message amd64_edac dumps when the system
doesn't support DRAM ECC or ECC checking is not enabled in the BIOS
used to trigger kerneloops which qualified the message as an OOPS thus
misleading the users. See, e.g.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/422536
http://bugzilla.kernel.org/show_bug.cgi?id=15238

Downgrade the message level to KERN_NOTICE and fix the formulation.

Cc: [email protected] # .32.x
Signed-off-by: Borislav Petkov <[email protected]>
Acked-by: Doug Thompson <[email protected]>

drivers/edac/amd64_edac.c

@@ -2658,10 +2658,11 @@ static void amd64_restore_ecc_error_reporting(struct amd64_pvt *pvt)
  * the memory system completely. A command line option allows to force-enable
  * hardware ECC later in amd64_enable_ecc_error_reporting().
  */
-static const char *ecc_warning =
-	"WARNING: ECC is disabled by BIOS. Module will NOT be loaded.\n"
-	" Either Enable ECC in the BIOS, or set 'ecc_enable_override'.\n"
-	" Also, use of the override can cause unknown side effects.\n";
+static const char *ecc_msg =
+	"ECC disabled in the BIOS or no ECC capability, module will not load.\n"
+	" Either enable ECC checking or force module loading by setting "
+	"'ecc_enable_override'.\n"
+	" (Note that use of the override may cause unknown side effects.)\n";
 
 static int amd64_check_ecc_enabled(struct amd64_pvt *pvt)
 {
@@ -2673,21 +2674,21 @@ static int amd64_check_ecc_enabled(struct amd64_pvt *pvt)
 
 	ecc_enabled = !!(value & K8_NBCFG_ECC_ENABLE);
 	if (!ecc_enabled)
-		amd64_printk(KERN_WARNING, "This node reports that Memory ECC "
+		amd64_printk(KERN_NOTICE, "This node reports that Memory ECC "
 			     "is currently disabled, set F3x%x[22] (%s).\n",
 			     K8_NBCFG, pci_name(pvt->misc_f3_ctl));
 	else
 		amd64_printk(KERN_INFO, "ECC is enabled by BIOS.\n");
 
 	nb_mce_en = amd64_nb_mce_bank_enabled_on_node(pvt->mc_node_id);
 	if (!nb_mce_en)
-		amd64_printk(KERN_WARNING, "NB MCE bank disabled, set MSR "
+		amd64_printk(KERN_NOTICE, "NB MCE bank disabled, set MSR "
 			     "0x%08x[4] on node %d to enable.\n",
 			     MSR_IA32_MCG_CTL, pvt->mc_node_id);
 
 	if (!ecc_enabled || !nb_mce_en) {
 		if (!ecc_enable_override) {
-			amd64_printk(KERN_WARNING, "%s", ecc_warning);
+			amd64_printk(KERN_NOTICE, "%s", ecc_msg);
 			return -ENODEV;
 		}
 		ecc_enable_override = 0;