Subject: Re: linux-next: Tree for May 4 --> mm: free_area_init: allow defining max_zone_pfn in descending order does increase memory use

From: Stephen Rothwell <[email-masked]>
Date: Tue, 5 May 2020 07:08:28 +1000

Hi Mike,

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

I have added that to linux-next for today.

-- 
Cheers,
Stephen Rothwell