mm: remove unneeded local variable in free_area_init_core

Local variable 'zone_start_pfn' is not needed since there's only one call
site in free_area_init_core().  Let's remove it and pass
zone->zone_start_pfn directly to init_currently_empty_zone().

Link: https://lkml.kernel.org/r/20210122135956.5946-6-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 56a59f5..35e230c 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6927,7 +6927,6 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
        for (j = 0; j < MAX_NR_ZONES; j++) {
                struct zone *zone = pgdat->node_zones + j;
                unsigned long size, freesize, memmap_pages;
-               unsigned long zone_start_pfn = zone->zone_start_pfn;
 
                size = zone->spanned_pages;
                freesize = zone->present_pages;
@@ -6976,7 +6975,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
 
                set_pageblock_order();
                setup_usemap(zone);
-               init_currently_empty_zone(zone, zone_start_pfn, size);
+               init_currently_empty_zone(zone, zone->zone_start_pfn, size);
                memmap_init_zone(zone);
        }
 }