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Date: Tue, 5 May 2020 07:08:28 +1000
From: Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: linux-next: Tree for May 4 --> mm: free_area_init: allow
 defining max_zone_pfn in descending order does increase memory use
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To: Mike Rapoport <rppt@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>, Linux Next Mailing List <linux-next@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Marc Hartmayer <mhartmay@linux.ibm.com>, linux-s390 <linux-s390@vger.kernel.org>, Vasily Gorbik <gor@linux.ibm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>

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Hi Mike,

On Mon, 4 May 2020 18:44:10 +0300 Mike Rapoport <rppt@linux.ibm.com> wrote:
>
> Ho Christian,
>=20
> On Mon, May 04, 2020 at 04:50:06PM +0200, Christian Borntraeger wrote:
> > Mike,
> > commit 51a2f644fd020d5f090044825c388444d11029d ("mm: free_area_init: al=
low defining max_zone_pfn in descending order")
> > does increase the memory use on s390 (e.g. 700 MB vs.1.8 GB).
> >=20
> > Something is odd in this patch. Any idea? =20
>=20
> Yeah, this patch is buggy. In short, it breaks zone size calculation on
> s390 and some other architectures.
>=20
> I've just replied at [1] with more details and a fix.
>=20
> [1] https://lore.kernel.org/linux-mm/20200504153901.GM14260@kernel.org/

I have added that to linux-next for today.

--=20
Cheers,
Stephen Rothwell

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