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

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Message-ID: <20080524054301.GA3773@uranus.ravnborg.org>
Date:	Sat, 24 May 2008 07:43:02 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Steve French <smfrench@...il.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: kernel coding style for if ... else which cross #ifdef

> *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.

	Sam
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