netdev - Re: [net-next:master 122/152] drivers/ptp/ptp_chardev.c:36 ptp_ioctl() warn: 'sysoff' puts 832 bytes on stack

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Message-ID: <20121103045339.GA2277@netboy.at.omicron.at>
Date:	Sat, 3 Nov 2012 05:53:39 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	yuanhan.liu@...ux.intel.com, changlongx.xie@...el.com,
	fengguang.wu@...el.com, netdev@...r.kernel.org
Subject: Re: [net-next:master 122/152] drivers/ptp/ptp_chardev.c:36
 ptp_ioctl() warn: 'sysoff' puts 832 bytes on stack

On Fri, Nov 02, 2012 at 09:39:28PM -0400, David Miller wrote:
> > I am aware that these methods use large stack buffers, but I thought
> > it was okay seeing as they are both under the 1k limit.
> 
> I think you should avoid such a local stack variable here.
> 
> It's not that big of a deal to use kmalloc or whatever so just
> do that and add the necessary kfree cleanups et al.

The usage pattern will be that the user calls these again and
again. For the sysoff it will be at least once every second, and for
the events it could be ASAP in a tight loop.

Isn't it being nicer to the memory allocation code not to repeatedly
request small chunks?

Thanks,
Richard
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