linux-kernel - [PATCH v2 2/3] mm/page_alloc: remove unnecessary check in break_down_buddy

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Date:   Sat, 26 Aug 2023 23:47:44 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, willy@...radead.org,
        naoya.horiguchi@....com, osalvador@...e.de
Subject: [PATCH v2 2/3] mm/page_alloc: remove unnecessary check in break_down_buddy_pages

1. We always have target in range started with next_page and full free
range started with current_buddy.
2. The last splited range size is 1 << low and low should be >= 0, then
size >= 1, then page + size and page will not interleave.
As summary, current_page will not equal to target page.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 mm/page_alloc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 88c5f5aea9b0..bb74b40dc195 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6510,10 +6510,8 @@ 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);
 	}
 }
 
-- 
2.30.0