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>

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).
   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