mm/mm_init.c: use memblock_region_memory_base_pfn() to get startpfn

Just like what it does in "if (mirrored_kernelcore)", we should use
memblock_region_memory_base_pfn() to get the startpfn.

Signed-off-by: Wei Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mike Rapoport (IBM) <[email protected]>

Author: RichardWeiYang

mm/mm_init.c

@@ -363,7 +363,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
 
 			nid = memblock_get_region_node(r);
 
-			usable_startpfn = PFN_DOWN(r->base);
+			usable_startpfn = memblock_region_memory_base_pfn(r);
 			zone_movable_pfn[nid] = zone_movable_pfn[nid] ?
 				min(usable_startpfn, zone_movable_pfn[nid]) :
 				usable_startpfn;