Re: CONFIG_* and user-visible #defines

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 25 Aug 1998 14:26:36 +0100 (BST)

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> Is there a clean way to have dependencies on a CONFIG_* option in parts of
> the kernel headers that aren't #ifdef __KERNEL__ ?
>
> I need to set (at least) HZ and PAGE_SIZE depending on CONFIG_SUN3X, but
> those definitions appear to be visible outside the kernel so including
> linux/config.h seems like a bad idea..

Put a machine type in the gcc spec file for your target and do

#ifdef __sun3__

HZ is a bad one as it leaks everywhere. Andi Kleen had a patch that makes
HZ visible (not settable) via sysctl and /proc/sys

Alan

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