linux-kernel - Re: [PATCH 1/2] mm: page_isolation: check pfn validity before access

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Message-ID: <xa1ta944ik8d.fsf@mina86.com>
Date:	Thu, 06 Nov 2014 13:31:14 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Weijie Yang <weijie.yang@...sung.com>,
	kamezawa.hiroyu@...fujitsu.com, 'Minchan Kim' <minchan@...nel.org>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>, mgorman@...e.de,
	'linux-kernel' <linux-kernel@...r.kernel.org>,
	'Linux-MM' <linux-mm@...ck.org>,
	'Weijie Yang' <weijie.yang.kh@...il.com>
Subject: Re: [PATCH 1/2] mm: page_isolation: check pfn validity before access

On Thu, Nov 06 2014, Weijie Yang <weijie.yang@...sung.com> wrote:
> In the undo path of start_isolate_page_range(), we need to check
> the pfn validity before access its page, or it will trigger an
> addressing exception if there is hole in the zone.
>
> Signed-off-by: Weijie Yang <weijie.yang@...sung.com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

> ---
>  mm/page_isolation.c |    7 +++++--
>  1 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/mm/page_isolation.c b/mm/page_isolation.c
> index d1473b2..3ddc8b3 100644
> --- a/mm/page_isolation.c
> +++ b/mm/page_isolation.c
> @@ -137,8 +137,11 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
>  undo:
>  	for (pfn = start_pfn;
>  	     pfn < undo_pfn;
> -	     pfn += pageblock_nr_pages)
> -		unset_migratetype_isolate(pfn_to_page(pfn), migratetype);
> +	     pfn += pageblock_nr_pages) {
> +		page = __first_valid_page(pfn, pageblock_nr_pages);
> +		if (page)
> +			unset_migratetype_isolate(page, migratetype);
> +	}
>  
>  	return -EBUSY;
>  }
> -- 
> 1.7.0.4
>
>

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<mpn@...gle.com>--<xmpp:mina86@...ber.org>--ooO--(_)--Ooo--
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