linux-kernel - Re: [PATCH] mm: incorrect overflow check in shrink

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Message-Id: <C71EB769-AD4F-4860-BC1D-0BEC268894AC@gmail.com>
Date:	Thu, 1 Dec 2011 04:57:10 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <jweiner@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: incorrect overflow check in shrink_slab()

On Dec 1, 2011, at 4:32 AM, KAMEZAWA Hiroyuki wrote:
> Nice catch but.... the 'total_scan" shouldn't be long ?
> Rather than type casting ?

Could be..  I am just trying to avoid signed integer overflow like
"total_scan += delta" in that case, which is undefined, even though
the kernel is compiled with -fno-strict-overflow.

- xi

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