linux-kernel - Re: [PATCH] mm/page_alloc: Make alloc_gigantic

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Message-ID: <20191016114934.GZ317@dhcp22.suse.cz>
Date:   Wed, 16 Oct 2019 13:49:34 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/page_alloc: Make alloc_gigantic_page() available for
 general use

On Wed 16-10-19 13:10:41, David Hildenbrand wrote:
> On 16.10.19 13:08, Michal Hocko wrote:
> > On Wed 16-10-19 10:56:16, David Hildenbrand wrote:
[...]
> > > Gigantic pages have to be aligned AFAIK.
> > 
> > Aligned to what? I do not see any guarantee like that in the existing
> > code.
> > 
> 
> pfn = ALIGN(zone->zone_start_pfn, nr_pages);

I am obviously blind! Sorry about the confusion.

-- 
Michal Hocko
SUSE Labs