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

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Date:	Wed, 30 Oct 2013 04:14:14 +0100
From:	Michael Opdenacker <michael.opdenacker@...e-electrons.com>
To:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
CC:	mmarek@...e.cz, akpm@...ux-foundation.org, joe@...ches.com,
	linux-kernel@...r.kernel.org,
	Michael Opdenacker <michael.opdenacker@...e-electrons.com>
Subject: Re: [PATCH] scripts/checkkconfig.py: find unused Kconfig parameters

Hi Yann,

Thank you for your review!

On 10/29/2013 07:06 PM, Yann E. MORIN wrote:

> I guess all these grep spawning are what makes it slow.
>
> I wonder if it would not be possible to invert the loop (in pseudo
> Python code):
>
>     for f in all_interesting_files:
>         read f in memory
>         for s in all_symbols:
>             if symbol is in f:
>                 remove f from all_symbols
>                 break the inner-most loop
You probably meant "remove s from all_symbols", but I got it.
>
> This way:
>   - you scan the tree only once
>   - as soon as a symbol is matched, it is removed, thus decreasing
>     the amount of checks done in further loops.
This sounds like a very good idea, thanks! I hope to have time to
implement a mix of it and Michal's proposal later this week, or at least
next week.

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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