linux-kernel - Re: latest list of unused Kconfig variables

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Message-ID: <20080213073242.5c069c25@zod.rchland.ibm.com>
Date:	Wed, 13 Feb 2008 07:32:42 -0600
From:	Josh Boyer <jwboyer@...il.com>
To:	"Robert P. J. Day" <rpjday@...shcourse.ca>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	viro@...iv.linux.org.uk
Subject: Re: latest list of unused Kconfig variables

On Wed, 13 Feb 2008 03:56:34 -0500 (EST)
"Robert P. J. Day" <rpjday@...shcourse.ca> wrote:

> 
>   now that 2.6.25-rc1 is out, i can start updating the output from my
> scanning scripts.  the first updated output is the list of currently
> unused Kconfig variables -- variables that are defined in some Kconfig
> file somewhere but appear to be entirely unused throughout the source
> tree.
> 
>   latest output here, sorted by architecture:
> 
> http://www.crashcourse.ca/wiki/index.php/Unused_CONFIG_variables
> 
> as always, there will probably be some false positives for one reason
> or another.
> 
>   output from the other scanning scripts will be up in short order.

You have lots of false positives (or something) for arch/powerpc.  Seems
your script picked up #define names and comments that happen to match a
Kconfig variable?  And you have false positives on several CPU
variables, as they are used within Kconfig files themselves to select
different sets of options.

For arch/ppc, the WANT_EARLY_SERIAL stuff was added by Al to fix those
boards that unconditionally called early_serial_setup by selecting
SERIAL_8250 in commit f08243a491f3e21feabbb04476a03fb0cbc975ff.  Al,
couldn't we just select SERIAL_8250 right in the board config
instead?  

Of course, arch/ppc is dying soon-ish anyway so we might not even
bother.

josh
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