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) <willy@infradead.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 94a8f6e8811abb2657bd2352f5e275b3058a6b94..63b9d500ec6cae6aec5a3ddb9fc51079b3f089ba 100644 (file)
--- 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);