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Date:   Tue, 28 Jul 2020 15:31:43 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Randy Dunlap <rdunlap@infradead.org>, broonie@kernel.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-next@vger.kernel.org, mhocko@suse.cz,
        mm-commits@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
        Jason Wang <jasowang@redhat.com>
Subject: Re: mmotm 2020-07-27-18-18 uploaded (mm/page_alloc.c)
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On Wed, 29 Jul 2020 08:20:53 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:

> Hi Andrew,
> 
> On Tue, 28 Jul 2020 14:55:53 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> > config CONTIG_ALLOC
> >         def_bool (MEMORY_ISOLATION && COMPACTION) || CMA
> > 
> > says this is an improper combination.  And `make oldconfig' fixes it up.
> > 
> > What's happening here?
> 
> CONFIG_VIRTIO_MEM selects CONFIG_CONTIG_ALLOC ...

Argh, select strikes again.

So I guess VIRTIO_MEM should also select COMPACTION?