linux-kernel - Re: [PATCH -mm 8/9] netconsole: Update documentation for dynamic reconfigurability

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Message-ID: <Pine.LNX.4.64.0707051913001.19842@cselinux1.cse.iitk.ac.in>
Date:	Thu, 5 Jul 2007 19:25:18 +0530 (IST)
From:	Satyam Sharma <ssatyam@....iitk.ac.in>
To:	Keiichi KII <k-keiichi@...jp.nec.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>,
	Joel Becker <joel.becker@...cle.com>,
	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH -mm 8/9] netconsole: Update documentation for dynamic
 reconfigurability

Hi Keiichi,

On Thu, 5 Jul 2007, Keiichi KII wrote:
> Hi Satyam,
> 
> > + cat enabled				# check if enabled is 1
> > + echo 0 > enabled			# disable the target (if required)
> > + echo eth2 > dev_name			# set local interface
> 
> I think that the above line should change from "echo eth2 > dev_name" to 
> "echo -n eth2 > dev_name" or the newline should be removed at store_dev_name().
> The default behavior of echo(1) outputs the newline. 
> So, if we write appropriate network device name to dev_name, 
> the netpoll can't find net_device in netpoll_setup(). 

Yes, you're right. I'll fix this in store_dev_name() itself, it isn't
right to limit users to only -n option. Thanks for pointing this out.

[ BTW I also noticed a typo in that file just above your extract that
mentions dev_name as a read-only attribute! That also must be fixed ... ]

> I don't have enough time now. So I will check your patches more specific 
> at the weekend.

Ok, thanks a lot. I'll wait for your comments / testing results over the
weekend, before sending out the next iteration.

BTW I did some testing myself, and have found another *embarrassing* bug:
if netconsole is loaded _without_ specifying any "netconsole=" parameter,
module is still kept loaded, but on unloading configfs_unregister_...()
obviously panics! :-) This should've been found by me earlier, just that
I never tested without specifying the parameter to modprobe :-(

Thanks,
Satyam
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