linux-kernel - Re: identifying CONFIG variable typoes in the source tree

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Message-ID: <Pine.LNX.4.64.0701232056040.7737@CPE00045a9c397f-CM001225dbafb6>
Date:	Tue, 23 Jan 2007 21:02:55 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Oleg Verych <olecom@...wer.upol.cz>
cc:	linux-kernel@...r.kernel.org
Subject: Re: identifying CONFIG variable typoes in the source tree

On Tue, 23 Jan 2007, Oleg Verych wrote:

> On 2007-01-23, Robert P. J. Day wrote:
> []
> >   what it does is scan the entire tree for lines of the form
> >
> > ...if... CONFIG_whatever...
> >
> > collects all of those CONFIG variables and, one at a time, checks to
> > see if that variable even exists in any Kconfig file in the tree so
> > that it could possibly ever be set.  (i'm not guaranteeing that the
> > script is perfect, but it does generate some interesting results.)
> >
> >   the first few lines of output:
> >
> > 53C700_BE_BUS
> > 64_BIT
> > 68328_SERIAL_UART2
> > ...
> >
> []
> >   the script turns up 284 examples of this.
>
> Next, this script must to learn how to search whom to send this info.
> And if there's nobody, just to make list of known orphans ;).

  i'm pretty sure that's not going to happen this evening, but i
tweaked the script just a bit so you can run it (from the top-level
directory) against any subdirectory to see what CONFIG symbols appear
to be (for lack of a better word) "orphaned."

  let's test it against, say, fs/xfs:

$ ../config_vars.sh fs/xfs
FS_POSIX_CAP
FS_POSIX_MAC
XFS_DEBUG
XFS_DMAPI
XFS_TRACE

$ grep -r FS_POSIX_CAP .
fs/xfs/xfs_cap.h:#ifdef CONFIG_FS_POSIX_CAP

$ grep -r FS_POSIX_MAC .
./fs/xfs/xfs_mac.h:#ifdef CONFIG_FS_POSIX_MAC

$ grep -r XFS_DEBUG .
./fs/xfs/xfs.h:#ifdef CONFIG_XFS_DEBUG
./fs/xfs/Makefile-linux-2.6:ifeq ($(CONFIG_XFS_DEBUG),y)

and so on.  of course, there may be good reasons for some of these
variables to be there with no corresponding Kconfig entry -- i'm just
printing them out.

rday

p.s. new script is attached.
Download attachment "config_vars.sh" of type "APPLICATION/x-sh" (435 bytes)