Commit 64632fd3 authored by Miaohe Lin's avatar Miaohe Lin Committed by Linus Torvalds
Browse files

mm/vmstat: simplify the array size calculation 

We can replace the array_num * sizeof(array[0]) with sizeof(array) to
simplify the code.

Link: https://lkml.kernel.org/r/20210715122911.15700-3-linmiaohe@huawei.com


Signed-off-by: default avatarMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ea15ba17

mm/vmstat.c

+3 −5
Original line number Diff line number Diff line
@@ -1891,16 +1891,14 @@ static bool need_update(int cpu) 
		/*

		 * The fast way of checking if there are any vmstat diffs.

		 */

		if (memchr_inv(pzstats->vm_stat_diff, 0, NR_VM_ZONE_STAT_ITEMS *

			       sizeof(pzstats->vm_stat_diff[0])))

		if (memchr_inv(pzstats->vm_stat_diff, 0, sizeof(pzstats->vm_stat_diff)))

			return true;



		if (last_pgdat == zone->zone_pgdat)

			continue;

		last_pgdat = zone->zone_pgdat;

		n = per_cpu_ptr(zone->zone_pgdat->per_cpu_nodestats, cpu);

		if (memchr_inv(n->vm_node_stat_diff, 0, NR_VM_NODE_STAT_ITEMS *

			       sizeof(n->vm_node_stat_diff[0])))

		if (memchr_inv(n->vm_node_stat_diff, 0, sizeof(n->vm_node_stat_diff)))

			return true;

	}

	return false;