linux-kernel - Re: [PATCH] scripts/checkkconfig.py: find unused Kconfig parameters

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Date:	Fri, 25 Oct 2013 15:38:52 +0200
From:	Michael Opdenacker <michael.opdenacker@...e-electrons.com>
To:	Joe Perches <joe@...ches.com>
CC:	mmarek@...e.cz, yann.morin.1998@...e.fr, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/checkkconfig.py: find unused Kconfig parameters

Hi Joe,

Thank you very much for your review!

On 10/24/2013 09:30 AM, Joe Perches wrote:
> On Thu, 2013-10-24 at 07:23 +0200, Michael Opdenacker wrote:
>
>> +def count_param(param):
>> +
>> +    global source_file, bad_params_in_file
>> +
>> +    if os.path.isdir('.git'):
>> +       # Use git grep when available
>> +       count = subprocess.check_output('git grep ' + param + '| grep -v defconfig | wc -l', shell=True)
>> +    else:
>> +       # Fallback to regular grep
>> +       count = subprocess.check_output('grep -R ' + param + ' . | grep -v defconfig | wc -l', shell=True)
> Doesn't the grep need -w?
Using "-w" is a good idea, and this way I can eliminate false negatives
(for example finding matches for "PRINTK_TIME" when I'm looking for
plain "PRINTK"). The only this is that I then need to look for both
"PARAM" (in Kconfig files, in case the parameter is just used for
dependency management), and for "CONFIG_PARAM" (in source files).
>
> Also, the regular grep could probably use something like
> 'grep -R -w --max-count=2 --include="*.[chS]"'
I can definitely use "--max-count=2".

 '--include="*.[chS]"' is more problematic because it excludes Kconfig
files. I'll use "-I" instead to just ignore binary files.

I'll soon send an update taking this into account.

Don't hesitate to send more comments.

Thanks again,

Michael.

-- 
Michael Opdenacker, CEO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
+33 484 258 098

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