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authorJarek Poplawski <jarkao2@o2.pl>2007-08-10 16:01:04 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-11 18:47:41 -0400
commitf8a745942b1b7f052cb76bb8a893d12cb6329c84 (patch)
tree11ae43b36bd76b64fb55e7c4d2a3255c635d3128 /Documentation/kbuild/kconfig-language.txt
parent09736bd36a19aa8c0630e626563e447213c372b5 (diff)
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: Jarek Poplawski <jarkao2@o2.pl> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/kbuild/kconfig-language.txt')
-rw-r--r--Documentation/kbuild/kconfig-language.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt
index 536d5bfbdb8d..fe8b0c4892cf 100644
--- a/Documentation/kbuild/kconfig-language.txt
+++ b/Documentation/kbuild/kconfig-language.txt
@@ -98,6 +98,15 @@ applicable everywhere (see syntax).
98 times, the limit is set to the largest selection. 98 times, the limit is set to the largest selection.
99 Reverse dependencies can only be used with boolean or tristate 99 Reverse dependencies can only be used with boolean or tristate
100 symbols. 100 symbols.
101 Note:
102 select is evil.... select will by brute force set a symbol
103 equal to 'y' without visiting the dependencies. So abusing
104 select you are able to select a symbol FOO even if FOO depends
105 on BAR that is not set. In general use select only for
106 non-visible symbols (no promts anywhere) and for symbols with
107 no dependencies. That will limit the usefulness but on the
108 other hand avoid the illegal configurations all over. kconfig
109 should one day warn about such things.
101 110
102- numerical ranges: "range" <symbol> <symbol> ["if" <expr>] 111- numerical ranges: "range" <symbol> <symbol> ["if" <expr>]
103 This allows to limit the range of possible input values for int 112 This allows to limit the range of possible input values for int