Hi,

On Wed, 10 Oct 2012 08:52:21 +0900 Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> wrote:
>
> 2012/10/10 8:45, Andrew Morton wrote:
> > On Wed, 10 Oct 2012 10:21:50 +1100 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> >
> >> Hi Linus,
> >>
> >> In Linus' tree, today's linux-next build (powerpc ppc64_defconfig) failed
> >> like this:
> >>
> >> arch/powerpc/platforms/pseries/hotplug-memory.c: In function 'pseries_remove_memblock':
> >> arch/powerpc/platforms/pseries/hotplug-memory.c:103:17: error: unused variable 'pfn' [-Werror=unused-variable]
> >>
> >> Caused by commit d760afd4d257 ("memory-hotplug: suppress "Trying to free
> >> nonexistent resource <XXXXXXXXXXXXXXXX-YYYYYYYYYYYYYYYY>" warning").
> >>
> >> I can't see what the point of the "pfn" variable is
> >
> > This:
> >
> > --- a/arch/powerpc/platforms/pseries/hotplug-memory.c~a
> > +++ a/arch/powerpc/platforms/pseries/hotplug-memory.c
> > @@ -101,7 +101,7 @@ static int pseries_remove_memblock(unsig
> >   	sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
> >   	for (i = 0; i < sections_to_remove; i++) {
> >   		unsigned long pfn = start_pfn + i * PAGES_PER_SECTION;
> > -		ret = __remove_pages(zone, start_pfn,  PAGES_PER_SECTION);
> > +		ret = __remove_pages(zone, pfn, PAGES_PER_SECTION);
> >   		if (ret)
> >   			return ret;
> >   	}
> 
> I believe the error to be fixed with this patch.
> Could you try it?

The certainly fixes the build problem.  I can't comment in the semantics
of the patch.

Tested-by: Stephen Rothwell <sfr@canb.auug.org.au>  (Build only)
-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au