xen/gnttab: Use phys_addr_t to describe the grant frame base address

On ARM, address size can be 32 bits or 64 bits (if CONFIG_ARCH_PHYS_ADDR_T_64BIT
is enabled).
We can't assume that the grant frame base address will always fits in an
unsigned long. Use phys_addr_t instead of unsigned long as argument for
gnttab_setup_auto_xlat_frames.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>

arch/arm/xen/enlighten.c

@@ -234,7 +234,7 @@ static int __init xen_guest_init(void)
 	const char *version = NULL;
 	const char *xen_prefix = "xen,xen-";
 	struct resource res;
-	unsigned long grant_frames;
+	phys_addr_t grant_frames;
 
 	node = of_find_compatible_node(NULL, NULL, "xen,xen");
 	if (!node) {
@@ -253,8 +253,8 @@ static int __init xen_guest_init(void)
 		return 0;
 	grant_frames = res.start;
 	xen_events_irq = irq_of_parse_and_map(node, 0);
-	pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
-			version, xen_events_irq, (grant_frames >> PAGE_SHIFT));
+	pr_info("Xen %s support found, events_irq=%d gnttab_frame=%pa\n",
+			version, xen_events_irq, &grant_frames);
 
 	if (xen_events_irq < 0)
 		return -ENODEV;