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

[Christian Borntraeger]

On 04.05.20 23:08, Stephen Rothwell wrote:
> Hi Mike,
> 
> On Mon, 4 May 2020 18:44:10 +0300 Mike Rapoport <rppt@xxxxxxxxxxxxx> 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/20200504153901.GM14260@xxxxxxxxxx/
> 
> I have added that to linux-next for today.
> 

Ack, 5.7.0-rc4-next-20200505 seems to work fine.