linux-kernel - Re: [PATCH v3 1/5] mm: pagewalk: add the ability to install PTEs

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Message-Id: <20241023160405.33995c68f20c141325a8fadb@linux-foundation.org>
Date: Wed, 23 Oct 2024 16:04:05 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>, "Liam R . Howlett"
 <Liam.Howlett@...cle.com>, Matthew Wilcox <willy@...radead.org>, Vlastimil
 Babka <vbabka@...e.cz>, "Paul E . McKenney" <paulmck@...nel.org>, Jann Horn
 <jannh@...gle.com>, David Hildenbrand <david@...hat.com>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, Muchun Song
 <muchun.song@...ux.dev>, Richard Henderson <richard.henderson@...aro.org>,
 Matt Turner <mattst88@...il.com>, Thomas Bogendoerfer
 <tsbogend@...ha.franken.de>, "James E . J . Bottomley"
 <James.Bottomley@...senPartnership.com>, Helge Deller <deller@....de>,
 Chris Zankel <chris@...kel.net>, Max Filippov <jcmvbkbc@...il.com>, Arnd
 Bergmann <arnd@...nel.org>, linux-alpha@...r.kernel.org,
 linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
 linux-arch@...r.kernel.org, Shuah Khan <shuah@...nel.org>, Christian
 Brauner <brauner@...nel.org>, linux-kselftest@...r.kernel.org, Sidhartha
 Kumar <sidhartha.kumar@...cle.com>, Jeff Xu <jeffxu@...omium.org>,
 Christoph Hellwig <hch@...radead.org>, linux-api@...r.kernel.org, John
 Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v3 1/5] mm: pagewalk: add the ability to install PTEs

On Wed, 23 Oct 2024 17:24:38 +0100 Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:

> 
> ...
>
> Existing mechanism for performing a walk which also installs page table
> entries if necessary are heavily duplicated throughout the kernel,

How complicated is it to migrate those to use this?

> ...
>
> We explicitly do not allow the existing page walk API to expose this
> feature as it is dangerous and intended for internal mm use only. Therefore
> we provide a new walk_page_range_mm() function exposed only to
> mm/internal.h.
>

Is this decision compatible with the above migrations?