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Commit f8a74594 authored by Jarek Poplawski's avatar Jarek Poplawski Committed by Linus Torvalds
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docs: note about select in kconfig-language.txt 



A warning note from Sam Ravnborg about kconfig's select evilness,
dependencies and the future (slightly corrected).

Signed-off-by: default avatarJarek Poplawski <jarkao2@o2.pl>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 09736bd3

Documentation/kbuild/kconfig-language.txt

+9 −0
Original line number Diff line number Diff line
@@ -98,6 +98,15 @@ applicable everywhere (see syntax). 
  times, the limit is set to the largest selection.

  Reverse dependencies can only be used with boolean or tristate

  symbols.

  Note:

	select is evil.... select will by brute force set a symbol

	equal to 'y' without visiting the dependencies. So abusing

	select you are able to select a symbol FOO even if FOO depends

	on BAR that is not set. In general use select only for

	non-visible symbols (no promts anywhere) and for symbols with

	no dependencies. That will limit the usefulness but on the

	other hand avoid the illegal configurations all over. kconfig

	should one day warn about such things.



- numerical ranges: "range" <symbol> <symbol> ["if" <expr>]

  This allows to limit the range of possible input values for int