linux-kernel - [PATCH] mm: Fix buddy list helpers

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Date:   Sat, 16 Feb 2019 09:07:02 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: Fix buddy list helpers

Tetsuo reports that free page statistics are not reporting correctly,
and Vlastimil noticed that "mm: Move buddy list manipulations into
helpers" botched one of its conversions of add_to_free_area(). Fix the
double-increment of ->nr_free.

Reported-by: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Reported-by: Vlastimil Babka <vbabka@...e.cz>
Cc: Michal Hocko <mhocko@...e.com>
Tested-by: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
Hi Andrew,

Please fold this into
mm-move-buddy-list-manipulations-into-helpers.patch.

 mm/page_alloc.c |    1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2a0969e3b0eb..da537fc39c54 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1851,7 +1851,6 @@ static inline void expand(struct zone *zone, struct page *page,
 			continue;
 
 		add_to_free_area(&page[size], area, migratetype);
-		area->nr_free++;
 		set_page_order(&page[size], high);
 	}
 }