Hi, If there are no other plans of kconfig docs update I think this message of yours should be useful enough. I made minimal fixes, so if they are wrong or you prefer it otherwise, I'm OK with any change to this proposal, including replacement with something else.
Thanks & regards, Jarek P. On Thu, Aug 02, 2007 at 11:36:59AM +0200, Sam Ravnborg wrote: ... > > > seems to select NET_POLL_CONTROLLER after selecting NETPOLL, but > > > still doesn't check for NETDEVICES dependency. > > > > That's odd. Adding Sam to the cc:. > > 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 suefullness but on the other hand avoid the illegal > configurations all over. > > kconfig should one day warn about such things but I have not fel inclined > to dive into the matters hoping that Roman does one day. > > Sam > -----------> Subject: docs: a warning note about select in kconfig-language.txt A warning note of Sam Ravnborg about kconfig's select evilness, dependencies and the future (slightly corrected). Signed-off-by: Jarek Poplawski <[EMAIL PROTECTED]> Cc: Sam Ravnborg <[EMAIL PROTECTED]> --- diff -Nu9r 2.6.23-rc1-/Documentation/kbuild/kconfig-language.txt 2.6.23-rc1/Documentation/kbuild/kconfig-language.txt --- 2.6.23-rc1-/Documentation/kbuild/kconfig-language.txt 2007-07-09 01:32:17.000000000 +0200 +++ 2.6.23-rc1/Documentation/kbuild/kconfig-language.txt 2007-08-06 12:50:34.000000000 +0200 @@ -92,18 +92,27 @@ - reverse dependencies: "select" <symbol> ["if" <expr>] While normal dependencies reduce the upper limit of a symbol (see below), reverse dependencies can be used to force a lower limit of another symbol. The value of the current menu symbol is used as the minimal value <symbol> can be set to. If <symbol> is selected multiple 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 and hex symbols. The user can only input a value which is larger than or equal to the first symbol and smaller than or equal to the second symbol. - help text: "help" or "---help---" This defines a help text. The end of the help text is determined by - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
