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mm/page_alloc: remove unnecessary check in break_down_buddy_pages

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Patch series "Two minor cleanups to break_down_buddy_pages", v2.

Two minor cleanups to break_down_buddy_pages.


This patch (of 2):

1. We always have target in range started with next_page and full free
   range started with current_buddy.

2. The last split range size is 1 << low and low should be >= 0, then
   size >= 1.  So page + size != page is always true (because size > 0). 
   As summary, current_page will not equal to target page.

Link: https://lkml.kernel.org/r/20230927103514.98281-1-shikemeng@huaweicloud.com
Link: https://lkml.kernel.org/r/20230927103514.98281-2-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kemeng Shi 2023-09-27 18:35:13 +08:00 committed by Andrew Morton
parent 9a12d103f7
commit 27e0db3c21
1 changed files with 2 additions and 4 deletions
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6
mm/page_alloc.c
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@ -6480,10 +6480,8 @@ static void break_down_buddy_pages(struct zone *zone, struct page *page,
if (set_page_guard(zone, current_buddy, high, migratetype))
continue;
if (current_buddy != target) {
add_to_free_list(current_buddy, zone, high, migratetype);
set_buddy_order(current_buddy, high);
}
add_to_free_list(current_buddy, zone, high, migratetype);
set_buddy_order(current_buddy, high);
}
}