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Date: Wed, 23 Oct 2024 16:04:05 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>, "Liam R . Howlett"
 <Liam.Howlett@oracle.com>, Matthew Wilcox <willy@infradead.org>, Vlastimil
 Babka <vbabka@suse.cz>, "Paul E . McKenney" <paulmck@kernel.org>, Jann Horn
 <jannh@google.com>, David Hildenbrand <david@redhat.com>,
 linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song
 <muchun.song@linux.dev>, Richard Henderson <richard.henderson@linaro.org>,
 Matt Turner <mattst88@gmail.com>, Thomas Bogendoerfer
 <tsbogend@alpha.franken.de>, "James E . J . Bottomley"
 <James.Bottomley@HansenPartnership.com>, Helge Deller <deller@gmx.de>,
 Chris Zankel <chris@zankel.net>, Max Filippov <jcmvbkbc@gmail.com>, Arnd
 Bergmann <arnd@kernel.org>, linux-alpha@vger.kernel.org,
 linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
 linux-arch@vger.kernel.org, Shuah Khan <shuah@kernel.org>, Christian
 Brauner <brauner@kernel.org>, linux-kselftest@vger.kernel.org, Sidhartha
 Kumar <sidhartha.kumar@oracle.com>, Jeff Xu <jeffxu@chromium.org>,
 Christoph Hellwig <hch@infradead.org>, linux-api@vger.kernel.org, John
 Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH v3 1/5] mm: pagewalk: add the ability to install PTEs
Message-Id: <20241023160405.33995c68f20c141325a8fadb@linux-foundation.org>
In-Reply-To: <9be732fd0e897453116b433fe2f468ef7795602e.1729699916.git.lorenzo.stoakes@oracle.com>
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On Wed, 23 Oct 2024 17:24:38 +0100 Lorenzo Stoakes <lorenzo.stoakes@oracle.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?