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From:   Dan Williams <dan.j.williams@intel.com>
Date:   Tue, 19 Jan 2021 21:48:52 -0800
Message-ID: <CAPcyv4jrrNthnSkj7RVjOMSDGJAoiw7KjniKaid5Jr-86B4Auw@mail.gmail.com>
Subject: Re: linux-next: build failure after merge of the akpm-current tree
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
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On Tue, Jan 19, 2021 at 9:25 PM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> Hi all,
>
> After merging the akpm-current tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
>
> mm/memory_hotplug.c: In function 'move_pfn_range_to_zone':
> mm/memory_hotplug.c:772:24: error: 'ZONE_DEVICE' undeclared (first use in this function)
>   772 |  if (zone_idx(zone) == ZONE_DEVICE) {
>       |                        ^~~~~~~~~~~
>
> Caused by commit
>
>   e821cf25cfee ("mm: teach pfn_to_online_page() about ZONE_DEVICE section collisions")
>
> I applied the patch from Randy Dunlap for today.
>
> That, however, lead to this warning:
>
> mm/memory_hotplug.c:730:13: warning: 'section_taint_zone_device' defined but not used [-Wunused-function]
>   730 | static void section_taint_zone_device(unsigned long pfn)
>       |             ^~~~~~~~~~~~~~~~~~~~~~~~~
>

I sent this one as an alternate:

http://lore.kernel.org/r/161111619868.2787408.1710192276369197040.stgit@dwillia2-desk3.amr.corp.intel.com