linux-kernel - Re: [PATCH 3/5] mm: Rename __thp_get_unmapped_area to mm_get_unmapped_area

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Message-ID: <bb6230a2-8a9d-4385-ab14-a40b273f4c60@lucifer.local>
Date: Mon, 16 Jun 2025 13:20:55 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Peter Xu <peterx@...hat.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, kvm@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alex Williamson <alex.williamson@...hat.com>, Zi Yan <ziy@...dia.com>,
        Alex Mastro <amastro@...com>, David Hildenbrand <david@...hat.com>,
        Nico Pache <npache@...hat.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
        Barry Song <baohua@...nel.org>
Subject: Re: [PATCH 3/5] mm: Rename __thp_get_unmapped_area to
 mm_get_unmapped_area_aligned

On Mon, Jun 16, 2025 at 09:14:28AM -0300, Jason Gunthorpe wrote:
> Also, probably 'aligned' is not the right name. This new function
> should be called by VMA owners that know they have pgoff aligned high
> order folios/pfns inside their mapping. The 'align' argument is the
> max order of their pgoff aligned folio/pfns.
>
> The purpose of the function is to adjust the resulting area to
> optimize for the high order folios that are present while following
> the uAPI rules for mmap.
>
> Maybe call it something like _order and document it like the above?

Right, if it were made clear this is explicitly related to higher order
folios that would go a long way to making the generalisation more
acceptable.

But we definitely need to have it not filter errors if it's generic.

>
>
> > I also am not okay to export it for no reason.
>
> The next patches are the reason.

Regardless exporting it like this raises the bar for quality here.