Re: 2.6 bug: kconfig implementation doesn't match the spec

From: Adrian Bunk (bunk_at_fs.tum.de)
Date: 08/08/03

  • Next message: Zwane Mwaikambo: "[PATCH][2.6] Setup P4 thermal interrupt vector on UP" 
    Date:	Fri, 8 Aug 2003 20:16:13 +0200
To: Roman Zippel <zippel@linux-m68k.org>

    On Fri, Aug 08, 2003 at 08:01:20PM +0200, Roman Zippel wrote:

    > Hi,

    Hi Roman,

    > On Fri, 8 Aug 2003, Adrian Bunk wrote:
    >
    > > > You probably forgot to set MODULES, tristate behaves like bool in this
    > > > case and FOO becomes 'y' and '!FOO' is 'n'.
    > >
    > > No, this is with CONFIG_MODULES=y.
    >
    > How did you set it? I tried your examples and got the expected and correct
    > result.

    ups, sorry, you are right. I switched between two trees and these
    examples were with CONFIG_MODULES=n. With CONFIG_MODULES=y I observe the
    correct results.

    > > According to your language definition,
    > > m && !m
    > > evaluates to "m" (it sounds a bit strange but follows directly from
    > > rules (5) and (7) together with the interpretation of "m" as 1 as
    > > explained in the section "Menu dependencies" of
    > > Documentation/kbuild/kconfig-language.txt).
    >
    > BTW the reason for (5) !<expr> -> 2-<expr> is that it becomes possible to
    > do various transformations with the expressions, e.g. !!<expr> == <expr>.

    OTOH, the expression
      FOO && !FOO
    is not always "n" as you might expect.

    > bye, Roman

    cu
    Adrian 

    -- 
       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed
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