linux-kernel - Re: [PATCH v2] drivers/idle: make intel_idle.c driver more explicitly non-modular

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Message-ID: <20160421124454.GJ13379@windriver.com>
Date:	Thu, 21 Apr 2016 08:44:55 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
CC:	<linux-kernel@...r.kernel.org>, Len Brown <len.brown@...el.com>,
	<rcochran@...utronix.de>, <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2] drivers/idle: make intel_idle.c driver more
 explicitly non-modular

[Re: [PATCH v2] drivers/idle: make intel_idle.c driver more explicitly non-modular] On 21/04/2016 (Thu 10:04) Daniel Lezcano wrote:

> On Wed, Apr 20, 2016 at 11:12:49PM -0400, Paul Gortmaker wrote:
> 
> [ ... ]
> 
> > > > We replace module.h with moduleparam.h since the file does declare
> > > > some module parameters, and leaving them as such is currently the
> > > > easiest way to remain compatible with existing boot arg use cases.
> > > 
> > > What about using __setup() ? so module* disappear from the file.
> > 
> > No, it can't be __setup since moduleparam uses an instance of the
> > filename as a prefix to the boot arg, and __setup does not.  And we
> > should stay compatible with existing boot arg use cases for people
> > who have embedded such a setting in their grub config a long time
> > ago and forgot it.  It would take looking at and likely extending the
> > early_param macro to provide a syntax compatible instance of what
> > the module_param currently does if I recall correctly -- hence the
> > above comment in the commit log.
> 
> -module_param(max_cstate, int, 0444);
> +static int __init max_cstate_param(char *str)
> +{
> +       max_cstate = simple_strtol(str, NULL, 0);
> +       return 1;
> +}
> +__setup("intel_idle.max_cstate=", max_cstate_param);

Yeah, I recall thinking it would be that easy too, but there was
something that happens when you manually insert the dot in there that
breaks processing.  I'd have to re-test to remind myself what failed.

Paul.
--

> 
>