linux-kernel - Re: finding your own dead "CONFIG

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Message-Id: <200705031202.56805.arnd@arndb.de>
Date:	Thu, 3 May 2007 12:02:56 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
Cc:	Satyam Sharma <satyam.sharma@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: finding your own dead "CONFIG_" variables

On Thursday 03 May 2007, Robert P. J. Day wrote:
> > Suggest: configfiles=$(find . -name 'Kconfig*' -or -name '*defconfig*')
> >
> > Some CONFIG_ options exist that are not declared anywhere in the
> > Kconfig files but defined directly in the arch/.../*defconfig*
> > files.
> 
> it's my understanding that entries in any defconfig files are
> *automatically* pruned at some point once a CONFIG_ variable no longer
> exists in any Kconfig file, so i'm not going to be touching those
> files.  also, adding that extra check wouldn't add anything useful to
> the output.


An interesting category would be a symbol that is

- used in a source file
- defined in an old defconfig
- not present in any Kconfig* file

If any of these exist, I would consider them _worse_ than the ones
found by your initial script, because some functionality that once
was there has been recently removed.

	Arnd <><
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