Commit 0dfca313 authored by Kemeng Shi's avatar Kemeng Shi Committed by Andrew Morton
Browse files

mm/page_alloc: remove unnecessary next_page in break_down_buddy_pages 

The next_page is only used to forward page in case target is in second
half range.  Move forward page directly to remove unnecessary next_page.

Link: https://lkml.kernel.org/r/20230927103514.98281-3-shikemeng@huaweicloud.com


Signed-off-by: default avatarKemeng Shi <shikemeng@huaweicloud.com>
Acked-by: default avatarNaoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 27e0db3c

mm/page_alloc.c

+2 −4
Original line number Diff line number Diff line
@@ -6462,20 +6462,18 @@ static void break_down_buddy_pages(struct zone *zone, struct page *page, 
				   int migratetype)

{

	unsigned long size = 1 << high;

	struct page *current_buddy, *next_page;

	struct page *current_buddy;



	while (high > low) {

		high--;

		size >>= 1;



		if (target >= &page[size]) {

			next_page = page + size;

			current_buddy = page;

			page = page + size;

		} else {

			next_page = page;

			current_buddy = page + size;

		}

		page = next_page;



		if (set_page_guard(zone, current_buddy, high, migratetype))

			continue;