diff options
| author | Matthew Wilcox <matthew@wil.cx> | 2008-04-19 16:45:11 -0400 |
|---|---|---|
| committer | Sam Ravnborg <sam@uranus.ravnborg.org> | 2008-04-28 16:59:31 -0400 |
| commit | dfecbec8b54038ef02835d2f8181e1f44bd080d2 (patch) | |
| tree | e11e4af68547133fc2bf9d77f905c700154c1396 /Documentation/kbuild | |
| parent | beda8ae7160bd7b521d9db274a27d8964dfba8ab (diff) | |
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). | |||
| 104 | Reverse dependencies can only be used with boolean or tristate | 104 | Reverse dependencies can only be used with boolean or tristate |
| 105 | symbols. | 105 | symbols. |
| 106 | Note: | 106 | Note: |
| 107 | select is evil.... select will by brute force set a symbol | 107 | select should be used with care. select will force |
| 108 | equal to 'y' without visiting the dependencies. So abusing | 108 | a symbol to a value without visiting the dependencies. |
| 109 | select you are able to select a symbol FOO even if FOO depends | 109 | By abusing select you are able to select a symbol FOO even |
| 110 | on BAR that is not set. In general use select only for | 110 | if FOO depends on BAR that is not set. |
| 111 | non-visible symbols (no prompts anywhere) and for symbols with | 111 | In general use select only for non-visible symbols |
| 112 | no dependencies. That will limit the usefulness but on the | 112 | (no prompts anywhere) and for symbols with no dependencies. |
| 113 | other hand avoid the illegal configurations all over. kconfig | 113 | That will limit the usefulness but on the other hand avoid |
| 114 | should one day warn about such things. | 114 | the illegal configurations all over. |
| 115 | kconfig should one day warn about such things. | ||
| 115 | 116 | ||
| 116 | - numerical ranges: "range" <symbol> <symbol> ["if" <expr>] | 117 | - numerical ranges: "range" <symbol> <symbol> ["if" <expr>] |
| 117 | This allows to limit the range of possible input values for int | 118 | This allows to limit the range of possible input values for int |