linux-kernel - Re: [PATCH 0/2] Fix parameter passed to page_mapcount_is

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Message-ID: <141f7331-43fd-4bf4-88ca-36c18b02b133@redhat.com>
Date: Fri, 21 Mar 2025 15:34:55 +1000
From: Gavin Shan <gshan@...hat.com>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
 willy@...radead.org, david@...hat.com, vbabka@...e.cz, osalvador@...e.de,
 gehao@...inos.cn, shan.gavin@...il.com
Subject: Re: [PATCH 0/2] Fix parameter passed to page_mapcount_is_type()

On 3/21/25 3:31 PM, Gavin Shan wrote:
> Found by code inspection. There are two places where the parameter
> passed to page_mapcount_is_type() is (page->__mapcount), which is
> correct since it should be one more than the value, as explained in
   ^^^^^^^
   s/correct/incorrect

> the comments to page_mapcount_is_type(): (a) page_has_type() in
> page-flags.h (b) __dump_folio() in mm/debug.c
> 
> PATCH[1] fixes the parameter for (a)
> PATCH[2] fixes the parameter for (b)
> 
> Gavin Shan (2):
>    mm: Fix parameter passed to page_mapcount_is_type()
>    mm/debug: Fix parameter passed to page_mapcount_is_type()
> 
>   include/linux/page-flags.h | 2 +-
>   mm/debug.c                 | 4 ++--
>   2 files changed, 3 insertions(+), 3 deletions(-)
>