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* identifying CONFIG variable typoes in the source tree
@ 2007-01-23 21:13 Robert P. J. Day
  2007-01-23 23:35 ` Oleg Verych
  2007-01-24  8:21 ` Geert Uytterhoeven
  0 siblings, 2 replies; 5+ messages in thread
From: Robert P. J. Day @ 2007-01-23 21:13 UTC (permalink / raw)
  To: Linux kernel mailing list


  because it's cold outside and i was bored, i put together the
following script, to be run from the top of the source tree:

======================================================B
#!/bin/sh

CV=$(grep -rh "^#.*if.* CONFIG_[A-Za-z0-9]" . | grep -v endif)
CVARS=$(echo "${CV}" | sed "s/.*\(CONFIG_[^	 =\)\*\/]*\).*/\1/" | sort -u | grep "^CONFIG_")

kcfiles=$(find . -name "Kconfig*")

for cv in ${CVARS} ; do
	# echo "cv = ${cv}"
	str=$(echo ${cv} | sed "s/^CONFIG_//")
	# echo "str = ${str}"
	grep -wq ${str} ${kcfiles} || echo ${str}
done
=======================================================

  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
...

  let's check these:

$ grep -r 53C700_BE_BUS .
./drivers/scsi/53c700.h:#ifdef CONFIG_53C700_BE_BUS

  in short, a variable that's being tested with no possibility of ever
being set in a Kconfig file.  moving on,

$ grep -rw CONFIG_64_BIT .
./include/asm-um/elf-ppc.h:#ifdef CONFIG_64_BIT
$ grep -rw 64_BIT .
$

  so CONFIG_64_BIT is similarly being tested, but it's not being set
anywhere.  i'm guessing this is a misspelling of "CONFIG_64BIT", which
*does* exist in the tree and is quite common.  next:

$ grep -r 68328_SERIAL_UART2 .
./drivers/serial/68328serial.h:#ifndef CONFIG_68328_SERIAL_UART2
./arch/m68knommu/platform/68VZ328/config.c:#ifdef CONFIG_68328_SERIAL_UART2

  again, something being tested with no possibility of it being set
anywhere.

  the script turns up 284 examples of this.

rday

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2007-01-24 10:33 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-01-23 21:13 identifying CONFIG variable typoes in the source tree 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

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