linux-kernel - Re: [PATCH 1/6] memcg: replace unsigned long by u64 to avoid overflow

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Message-ID: <20120623090339.GA6184@kernel>
Date:	Sat, 23 Jun 2012 17:03:39 +0800
From:	Wanpeng Li <liwp.linux@...il.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	linux-mm@...ck.org, Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Minchan Kim <minchan@...nel.org>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Gavin Shan <shangw@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/6] memcg: replace unsigned long by u64 to avoid overflow

On Sat, Jun 23, 2012 at 10:15:14AM +0200, Johannes Weiner wrote:
>On Sat, Jun 23, 2012 at 02:15:34PM +0800, Wanpeng Li wrote:
>> From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
>> 
>> Since the return value variable in mem_cgroup_zone_nr_lru_pages and
>> mem_cgroup_node_nr_lru_pages functions are u64, so replace the return
>> value of funtions by u64 to avoid overflow.
>
>I wonder what 16 TB of memory must think running on a 32-bit kernel...
>"What is this, an address space for ants?"

Hi Johannes,

You mean change all u64 in memcg to unsigned long? or something I
miss....

Regards,
Wanpeng Li
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