linux-kernel - Re: [PATCH v2, part2 10/10] mm/x86: use free_highmem_page() to free highmem pages into buddy system

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Date:	Sun, 10 Mar 2013 12:40:49 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Cong Wang <amwang@...hat.com>, Yinghai Lu <yinghai@...nel.org>,
	Attilio Rao <attilio.rao@...rix.com>, konrad.wilk@...cle.com
Subject: Re: [PATCH v2, part2 10/10] mm/x86: use free_highmem_page() to free
 highmem pages into buddy system

On Sun, Mar 10, 2013 at 12:32 PM, Pekka Enberg <penberg@...nel.org> wrote:
> On Sun, Mar 10, 2013 at 10:01 AM, Jiang Liu <liuj97@...il.com> wrote:
>> Use helper function free_highmem_page() to free highmem pages into
>> the buddy system.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
>> ---
>>  arch/x86/mm/highmem_32.c |    1 -
>>  arch/x86/mm/init_32.c    |   10 +---------
>>  2 files changed, 1 insertion(+), 10 deletions(-)
>>
>> diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
>> index 6f31ee5..252b8f5 100644
>> --- a/arch/x86/mm/highmem_32.c
>> +++ b/arch/x86/mm/highmem_32.c
>> @@ -137,5 +137,4 @@ void __init set_highmem_pages_init(void)
>>                 add_highpages_with_active_regions(nid, zone_start_pfn,
>>                                  zone_end_pfn);
>>         }
>> -       totalram_pages += totalhigh_pages;
>
> Hmm? I haven't looked at what totalram_pages is used for but could you
> explain why this change is safe?

Never mind, I should have read the patchset more carefully:

Reviewed-by: Pekka Enberg <penberg@...nel.org>
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