linux-kernel - Unused config options in drivers/mtd (Re: running my kernel scanning scripts on your favourite part of the tree)

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Date:	Thu, 25 Nov 2010 17:14:40 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	"Robert P. J. Day" <rpjday@...shcourse.ca>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org
Subject: Unused config options in drivers/mtd (Re: running my kernel scanning
 scripts on your favourite part of the tree)

CC the mtd maintainer and mailinglist and adjusted subject. Robert, you
should report such bugs to the maintainer / author of the code in
question, otherwise your mail might end up unnoticed on LKML.

Michal

On 9.11.2010 13:16, Robert P. J. Day wrote:
> 
>   not sure when i'll get the time to do another pass over the kernel
> source tree with my kernel cleanup scripts but anyone who's
> interested is welcome to download the scripts from here:
> 
>   http://www.crashcourse.ca/wiki/index.php/Kernel_cleanup_scripts
> 
> to check out whatever part of the tree they want.
> 
>   as a simple example, i can run the script to find "badref" config
> variables on, say, the drivers/mtd part of the tree:
> 
> $ ../s/find_badref_configs.sh drivers/mtd
>>>>>> MTD_SUPERH_RESERVE
> drivers/mtd/maps/solutionengine.c:38:#ifdef CONFIG_MTD_SUPERH_RESERVE
> drivers/mtd/maps/solutionengine.c:44:		.size = CONFIG_MTD_SUPERH_RESERVE,
> drivers/mtd/maps/solutionengine.c:54:#endif /* CONFIG_MTD_SUPERH_RESERVE */
> drivers/mtd/maps/solutionengine.c:97:#ifdef CONFIG_MTD_SUPERH_RESERVE
> drivers/mtd/maps/solutionengine.c:100:		       CONFIG_MTD_SUPERH_RESERVE);
> drivers/mtd/maps/solutionengine.c:104:#endif /* CONFIG_MTD_SUPERH_RESERVE */
> $
> 
>   that tells me that, under drivers/mtd, there's some file that
> insists on testing CONFIG_MTD_SUPERH_RESERVE even though no Kconfig
> file defines such a variable.
> 
>   the other common check is to look for the exact opposite --
> variables defined in a Kconfig file that are never tested anywhere.
> once again, let's pick on drivers/mtd:
> 
> $ ../s/find_unused_configs.sh drivers/mtd
> ===== MTD_NAND_ATMEL_ECC_SOFT
> drivers/mtd/nand/Kconfig:375:config MTD_NAND_ATMEL_ECC_SOFT
> $
> 
>   that should be self-explanatory.  anyway, have at it if it interests
> you.
> 
> rday
> 
> 

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