linux-kernel - Re: [PATCH v2 -mm 3/9] netconsole: Simplify boot/module option setup logic

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Message-ID: <46978150.80909@bx.jp.nec.com>
Date:	Fri, 13 Jul 2007 22:42:40 +0900
From:	KII Keiichi <k-keiichi@...jp.nec.com>
To:	Satyam Sharma <ssatyam@....iitk.ac.in>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Matt Mackall <mpm@...enic.com>,
	Netdev <netdev@...r.kernel.org>,
	Joel Becker <joel.becker@...cle.com>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v2 -mm 3/9] netconsole: Simplify boot/module option setup
 logic

Hi Satyam,

> From: Satyam Sharma <ssatyam@....iitk.ac.in>
> 
> [3/9] netconsole: Simplify boot/module option setup logic
> 
> Presently, for built-in netconsole:
> 
> __setup(..., option_setup) ensures that the option_setup() function is
> called at boot-time from obsolete_checksetup() with the string matching
> "netconsole=" passed to it from the kernel's command line. We call the
> netpoll_parse_options() from in there, and populate the netpoll struct
> with the passed values. Then, when init_netconsole() is called during the
> initcall phase, strlen(config) fails, thus skipping option_setup().
> 
> For modular netconsole:
> 
> module_param_string() ensures that the string corresponding to the
> "netconsole" module parameter passed from the modprobe command line is
> copied into the "config" static variable. This time, when the module is
> being initialized, strlen(config) is true and so option_setup() is called
> on "config" from init_netconsole() and the input string is parsed and the
> netpoll struct populated.
> 
> Hence, quite different things happen in the copying and parsing of the
> passed netpoll parameters for the modular / built-in cases. This patch
> makes both of them similar by doing exactly the equivalent of a
> module_param_string() in option_setup() also -- just copying the param
> string passed from the kernel command line into the "config" static
> variable. So, init_netconsole() parses (using netpoll_parse_options())
> it in both the cases, and makes the logic somewhat simpler.
> 
> Now, option_setup() is only ever called / used for the built-in case,
> so we put it inside a #ifndef MODULE, otherwise gcc will complain about
> option_setup() being "defined but not used".
> 
> Also, the "configured" variable is redundant with this patch and so removed.
> 
> Signed-off-by: Satyam Sharma <ssatyam@....iitk.ac.in>
> Cc: Keiichi Kii <k-keiichi@...jp.nec.com>
> 
Signed-off-by: Keiichi Kii <k-keiichi@...jp.nec.com>

Thanks
-- 
Keiichi KII
NEC Corporation OSS Platform Development Division
E-mail: k-keiichi@...jp.nec.com 
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