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| author | Matthew Wilcox <matthew@wil.cx> | 2008-04-19 14:45:11 -0600 |
|---|---|---|
| committer | Sam Ravnborg <sam@uranus.ravnborg.org> | 2008-04-28 22:59:31 +0200 |
| commit | dfecbec8b54038ef02835d2f8181e1f44bd080d2 (patch) | |
| tree | e11e4af68547133fc2bf9d77f905c700154c1396 /Documentation/kbuild | |
| parent | beda8ae7160bd7b521d9db274a27d8964dfba8ab (diff) | |
| download | linux-dfecbec8b54038ef02835d2f8181e1f44bd080d2.tar.bz2 | |
kconifg: 'select' considered less evil
While select should be used with care, it is not actually evil.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'Documentation/kbuild')
| -rw-r--r-- | Documentation/kbuild/kconfig-language.txt | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt index 649cb8799890..00b950d1c193 100644 --- a/Documentation/kbuild/kconfig-language.txt +++ b/Documentation/kbuild/kconfig-language.txt @@ -104,14 +104,15 @@ applicable everywhere (see syntax). 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 prompts 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. + select should be used with care. select will force + a symbol to a value without visiting the dependencies. + By 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 prompts 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 |