xen/xenbus: Rename the variable xen_store_mfn to xen_store_gfn

The variable xen_store_mfn is effectively storing a GFN and not an MFN.
Signed-off-by: Julien Grall <julien.grall@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

drivers/xen/xenbus/xenbus_probe.c

@@ -75,7 +75,7 @@ EXPORT_SYMBOL_GPL(xen_store_interface);
 enum xenstore_init xen_store_domain_type;
 EXPORT_SYMBOL_GPL(xen_store_domain_type);
 
-static unsigned long xen_store_mfn;
+static unsigned long xen_store_gfn;
 
 static BLOCKING_NOTIFIER_HEAD(xenstore_chain);
 
@@ -711,7 +711,7 @@ static int __init xenstored_local_init(void)
 	if (!page)
 		goto out_err;
 
-	xen_store_mfn = xen_start_info->store_mfn = virt_to_gfn((void *)page);
+	xen_store_gfn = xen_start_info->store_mfn = virt_to_gfn((void *)page);
 
 	/* Next allocate a local port which xenstored can bind to */
 	alloc_unbound.dom        = DOMID_SELF;
@@ -785,12 +785,12 @@ static int __init xenbus_init(void)
 		err = xenstored_local_init();
 		if (err)
 			goto out_error;
-		xen_store_interface = gfn_to_virt(xen_store_mfn);
+		xen_store_interface = gfn_to_virt(xen_store_gfn);
 		break;
 	case XS_PV:
 		xen_store_evtchn = xen_start_info->store_evtchn;
-		xen_store_mfn = xen_start_info->store_mfn;
-		xen_store_interface = gfn_to_virt(xen_store_mfn);
+		xen_store_gfn = xen_start_info->store_mfn;
+		xen_store_interface = gfn_to_virt(xen_store_gfn);
 		break;
 	case XS_HVM:
 		err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
@@ -800,9 +800,9 @@ static int __init xenbus_init(void)
 		err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v);
 		if (err)
 			goto out_error;
-		xen_store_mfn = (unsigned long)v;
+		xen_store_gfn = (unsigned long)v;
 		xen_store_interface =
-			xen_remap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
+			xen_remap(xen_store_gfn << PAGE_SHIFT, PAGE_SIZE);
 		break;
 	default:
 		pr_warn("Xenstore state unknown\n");