Re: Export swapper_space

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Thu, Jun 03, 2004 at 04:37:27PM +0100, Christoph Hellwig wrote:
> On Thu, Jun 03, 2004 at 04:19:10PM +0100, Russell King wrote:
> > swapper_space appears to be needed by modules:
> > 
> >   Building modules, stage 2.
> >   MODPOST
> > *** Warning: "swapper_space" [drivers/block/loop.ko] undefined!
> > *** Warning: "swapper_space" [drivers/scsi/st.ko] undefined!
> > *** Warning: "swapper_space" [drivers/scsi/sg.ko] undefined!
> 
> Please not.  This seems to be some cache-flushing magic on the stranger
> architectures again :)  Can you check how they're using it in the end
> and hopefully fix it by uninlining something?

extern struct address_space swapper_space;
static inline struct address_space *page_mapping(struct page *page)
{
        struct address_space *mapping = NULL;
 
        if (unlikely(PageSwapCache(page)))
                mapping = &swapper_space;
        else if (likely(!PageAnon(page)))
                mapping = page->mapping;
        return mapping;
}

I'll leave that for someone else to sort out.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core