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Commit dfecbec8 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Sam Ravnborg
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kconifg: 'select' considered less evil 



While select should be used with care, it is not actually evil.

Signed-off-by: default avatarMatthew Wilcox <willy@linux.intel.com>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent beda8ae7

Documentation/kbuild/kconfig-language.txt

+9 −8
Original line number Original line Diff line number Diff line
@@ -104,14 +104,15 @@ applicable everywhere (see syntax). 
  Reverse dependencies can only be used with boolean or tristate

  Reverse dependencies can only be used with boolean or tristate

  symbols.

  symbols.

  Note:

  Note:

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

	select should be used with care. select will force

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

	a symbol to a value without visiting the dependencies.

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

	By abusing select you are able to select a symbol FOO even

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

	if FOO depends on BAR that is not set.

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

	In general use select only for non-visible symbols

	no dependencies. That will limit the usefulness but on the

	(no prompts anywhere) and for symbols with no dependencies.

	other hand avoid the illegal configurations all over. kconfig

	That will limit the usefulness but on the other hand avoid

	should one day warn about such things.

	the illegal configurations all over.

	kconfig should one day warn about such things.





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

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

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

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