Re: [RFC/PATCH] unregister_node() for hotplug use

[Greg KH <gregkh@suse.de>]

On Fri, Apr 22, 2005 at 12:30:09AM +0900, Keiichiro Tokunaga wrote:
> +#ifdef CONFIG_HOTPLUG
> +void unregister_node(struct node *node)
> +{
> +	sysdev_remove_file(&node->sysdev, &attr_cpumap);
> +	sysdev_remove_file(&node->sysdev, &attr_meminfo);
> +	sysdev_remove_file(&node->sysdev, &attr_numastat);
> +	sysdev_remove_file(&node->sysdev, &attr_distance);
> +
> +	sysdev_unregister(&node->sysdev);
> +}
> +EXPORT_SYMBOL_GPL(register_node);
> +EXPORT_SYMBOL_GPL(unregister_node);
> +#else /* !CONFIG_HOTPLUG */
> +void unregister_node(struct node *node)
> +{
> +}
> +#endif /* !CONFIG_HOTPLUG */

Oops, you only exported the symbols if CONFIG_HOTPLUG is enabled, not a
good idea.  Either make the null functions in a .h file if the option is
not enabled, or always export them.

And the comment for the #endif isn't really needed, as the whole #ifdef
fits on a single screen :)

And hey, what's the real big deal here, why not always have this
function no matter if CONFIG_HOTPLUG is enabled or not?  I really want
to just make that an option that is always enabled anyway, but changable
if you are using CONFIG_TINY or something...

thanks,

greg k-h