From 20605eb5bbea8184d2bb356d7e1419c8ec359efb Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Thu, 6 Nov 2025 20:14:50 +0000 Subject: [PATCH] memory_hotplug: optimise try_offline_memory_block() Extract the zone number directly from the page instead of using the page's zone number to look up the zone and asking the zone what its number is. Link: https://lkml.kernel.org/r/20251106201452.2292631-3-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Cc: David Hildenbrand Cc: Oscar Salvador Signed-off-by: Andrew Morton --- mm/memory_hotplug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 94a8f6e8811ab..63b9d500ec6ca 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -2327,7 +2327,7 @@ static int try_offline_memory_block(struct memory_block *mem, void *arg) * by offlining code ... so we don't care about that. */ page = pfn_to_online_page(section_nr_to_pfn(mem->start_section_nr)); - if (page && zone_idx(page_zone(page)) == ZONE_MOVABLE) + if (page && page_zonenum(page) == ZONE_MOVABLE) online_type = MMOP_ONLINE_MOVABLE; rc = device_offline(&mem->dev); -- 2.47.3