EDAC, amd64: Add x86cpuid sanity check during init

Match one of the devices in amd64_cpuids[] before loading the module.
This is an additional sanity check against users trying to load
amd64_edac_mod on unsupported systems.

Signed-off-by: Yazen Ghannam <[e-mail]>
Cc: linux-edac <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
[ Get rid of err_ret label, make it a bit more readable this way. ]
Signed-off-by: Borislav Petkov <[e-mail]>

drivers/edac/amd64_edac.c

···
 	int err = -ENODEV;
 	int i;
 
+	if (!x86_match_cpu(amd64_cpuids))
+		return -ENODEV;
+
 	if (amd_cache_northbridges() < 0)
-		goto err_ret;
+		return -ENODEV;
 
 	opstate_init();
 
···
 	kfree(ecc_stngs);
 	ecc_stngs = NULL;
 
-err_ret:
 	return err;
 }
 

drivers/edac/amd64_edac.h

···
 #include <linux/slab.h>
 #include <linux/mmzone.h>
 #include <linux/edac.h>
+#include <asm/cpu_device_id.h>
 #include <asm/msr.h>
 #include "edac_module.h"
 #include "mce_amd.h"