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: <20121102085915.GC2486@netboy.at.omicron.at>
Date:	Fri, 2 Nov 2012 09:59:15 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Cc:	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 10:06:31AM +0800, Yuanhan Liu wrote:
> 
> Hi Richard,
> 
> _just_ FYI and let you aware of it, there are new smatch warnings show up in
> 
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
> head:   b77bc2069d1e437d5a1a71bb5cfcf4556ee40015
> commit: 215b13dd288c2e1e4461c1530a801f5f83e8cd90 [122/152] ptp: add an ioctl to compare PHC time with system time
> 
> + drivers/ptp/ptp_chardev.c:36 ptp_ioctl() warn: 'sysoff' puts 832 bytes on stack
>   drivers/ptp/ptp_chardev.c:144 ptp_read() warn: 'event' puts 960 bytes on stack

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.

Thanks,
Richard
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