linux-kernel - Re: [PATCH] platform_driver_register: warn if probe is in .init.text

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Date:	Mon, 25 Jan 2010 11:31:08 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform_driver_register: warn if probe is in .init.text

On Mon, Jan 25, 2010 at 08:25:40PM +0100, Uwe Kleine-König wrote:
> Hello Dmitry,
> 
> > > > > +	if (drv->probe && kernel_init_text_address((unsigned long)drv->probe))
> > > > > +		pr_warning("oops-warning: probe function of platform driver %s"
> > > > > +			       " lives in .init.text\n", drv->driver.name);
> > > > > +#else
> > > > > +	/*
> > > > > +	 * without HOTPLUG probe functions can be discarded after the driver is
> > > > > +	 * loaded.
> > > > > +	 * There is a little chance for false positives, namely if the driver is
> > > > > +	 * registered after the .init sections are discarded.
> > > > > +	 */
> > > > > +	if (drv->probe && !kernel_init_text_address((unsigned long)drv->probe))
> > > > > +		pr_info("probably the probe function of platform driver %s can"
> > > > > +				" be moved to .init.text\n", drv->driver.name);
> > > > 
> > > > It really depends on the user's (or rather builder's) local
> > > > configuration so how can we make this suggestion?
> > > Can you point out a situation that makes the suggestion wrong?  AFAIK
> > > there only the possibility that the driver is loaded after .init is
> > > discarded (as written in the comment).
> > > 
> > 
> > The presence of CONFIG_HOTPLUG depends on particular .config, so, for
> > example, you may not have it set while I have. So you will boot, get the
> > suggestion, submit a patch, then I will boot and will get a warning that
> > the probe function is in wrong section.
> > 
> > So in general I wonder if it is possible to request that all probe
> > functions are marked as __devinit or not marked at all, regardless of
> > CONFIG_HOTPLUG and CONFIG_MODULE settings.
> Would you agree if the message would change to
> 
> 	probably the probe function of platform driver %s can be moved
> 	to .devinit.text
> 
> ?

How about "Consider marking the probe function as '__devinit'"?

-- 
Dmitry
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