linux-kernel - Re: [PATCH 2/3] zsmalloc: add generic path and remove x86 dependency

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Message-ID: <4FEB5A7E.8040500@linux.vnet.ibm.com>
Date:	Wed, 27 Jun 2012 14:09:50 -0500
From:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Nitin Gupta <ngupta@...are.org>
Subject: Re: [PATCH 2/3] zsmalloc: add generic path and remove x86 dependency

On 06/27/2012 12:28 AM, Minchan Kim wrote:
>> +{
>> +	if (area->vm)
>> +		return 0;
> 
> 
> Just out of curiosity.
> When do we need above check?

I did this in the case that there was a race between the for
loop in zs_init(), calling zs_cpu_notifier(), and a CPU
coming online.  I've never seen the condition hit, but if it
did, it would leak memory without this check.

I would move the cpu notifier registration after the loop in
zs_init(), but then I could miss a cpu up event and we
wouldn't have the needed per-cpu resources for mapping.

All other suggestions are accepted.  Thanks for the feedback!

--
Seth

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