Re: kernel coding style for if ... else which cross #ifdef

From: Sam Ravnborg
Date: Sat May 24 2008 - 02:42:03 EST


On Fri, May 23, 2008 at 10:42:58PM -0700, H. Peter Anvin wrote:
> Sam Ravnborg wrote:
> >>*However*, the best would really be if we changed Kconfig to emit
> >>configuration constants what were 0/1 instead of undefined/defined.
> >>That way we could do:
> >>
> >> if (CONFIG_SOMETHING && foo) {
> >> /* ... something ... */
> >> } else if ((mode & S_IWUGO) == 0) {
> >> /* ... */
> >
> >We could do that - but then it would need another
> >name not to clash with all the places where we rely
> >on CONFIG_FOO='n' => CONFIG_FOO is not defined.
> >
> >We could teach kconfig to emit something like:
> >#define KFOO 0 (for the 'n' value)
> >And 1 or 2 for the y and m values.
> >
>
> I don't think we want to use "1 or 2"... I suspect we want to use the
> same booleans we currently have.
I'm a bit dense (or I need more coffe - it's morning here).
What "same booleans"?

> I would suggest CFG_* instead of CONFIG_* for the new set.
Agreed.

Sam
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