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

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Message-ID: <alpine.LFD.1.00.0802131002310.28617@localhost.localdomain>
Date:	Wed, 13 Feb 2008 10:07:27 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Josh Boyer <jwboyer@...il.com>
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, Josh Boyer wrote:

> 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?

it always will, given the proclivity of some folks to define their own
variables with a "CONFIG_" prefix.  as i point out on the wiki page, i
make no attempt to cull that list, i just print it as is, and readers
will have to peruse the list carefully to see what's meaningful and
what isn't.

> And you have false positives on several CPU variables, as they are
> used within Kconfig files themselves to select different sets of
> options.

yes, i know ... perhaps there's a simple way to filter those out but,
at the moment, it's pure brute force.  i'm guessing i could make that
script a bit smarter but it probably isn't worth the investment in
time.  law of diminishing returns and all that.

> 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.

if that's the case, i can just stop scanning that entire directory.

rday
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry:
    Have classroom, will lecture.

http://crashcourse.ca                          Waterloo, Ontario, CANADA
========================================================================
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