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From: "Robert P. J. Day" <>
To: Geert Uytterhoeven <>
Cc: Linux kernel mailing list <>
Subject: Re: identifying CONFIG variable typoes in the source tree
Date: Wed, 24 Jan 2007 05:33:13 -0500 (EST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0701240511300.23168@CPE00045a9c397f-CM001225dbafb6> (raw)
In-Reply-To: <>

On Wed, 24 Jan 2007, Geert Uytterhoeven wrote:

> On Tue, 23 Jan 2007, Robert P. J. Day wrote:
> >   let's check these:
> >
> > $ grep -r 53C700_BE_BUS .
> > ./drivers/scsi/53c700.h:#ifdef CONFIG_53C700_BE_BUS
> This is the core support for big endian 53c700 SCSI busses. It's
> needed for various m68k machines, patch to be submitted when the
> m68k support is ready for submission.
> Gr{oetje,eeting}s,

  just to be clear, all that script is doing is identifying variables
of the form "CONFIG_fubar" that are being tested in *some*
preprocessor directive somewhere in the tree, but for which there is
apparently no corresponding entry in a Kconfig file anywhere that
could cause that variable to be configured.

  naturally, as geert suggests, this might represent a feature that's
in progress so it's clearly not a mistake.  but it's a good way to
trap potential problems, as in finding "GALILLEO_GT64240_ETH" which,
superficially, would seem like an obvious typo no matter what:

$ grep -r GALILLEO_GT64240_ETH .
./arch/mips/momentum/ocelot_g/prom.c:#ifdef CONFIG_GALILLEO_GT64240_ETH
./arch/mips/momentum/ocelot_g/prom.c:#ifdef CONFIG_GALILLEO_GT64240_ETH
./arch/mips/momentum/ocelot_g/setup.c:#ifdef CONFIG_GALILLEO_GT64240_ETH
./arch/mips/momentum/ocelot_g/setup.c:#ifdef CONFIG_GALILLEO_GT64240_ETH

as well as what is *obviously* dead code:

$ grep -rw CONFIG_KERNELD .
./sound/core/timer.c:#ifdef CONFIG_KERNELD
$ grep -rw KERNELD .
./net/core/dev.c: *             Bjorn Ekwall    :       Added KERNELD hack.

  the script isn't perfect -- it will generate false positives if the
variable is being set elsewhere -- perhaps hardcoded in the file or
defined in a Makefile.  but if you're curious, just run it against
your favourite subdirectory and see what comes up.


      reply	other threads:[~2007-01-24 10:33 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-23 21:13 Robert P. J. Day
2007-01-23 23:35 ` Oleg Verych
2007-01-24  2:02   ` Robert P. J. Day
2007-01-24  8:21 ` Geert Uytterhoeven
2007-01-24 10:33   ` Robert P. J. Day [this message]

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