linux-kernel - Re: [PATCH 3/5] mm: export zap_page_range_single and list_lru

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Message-ID: <8856c839-1a94-4e4d-9ded-d3b1627cd2cc@kernel.org>
Date: Thu, 5 Feb 2026 13:13:57 +0100
From: "David Hildenbrand (arm)" <david@...nel.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Alice Ryhl <aliceryhl@...gle.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Carlos Llamas <cmllamas@...gle.com>, Alexander Viro
 <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>,
 Jan Kara <jack@...e.cz>, Paul Moore <paul@...l-moore.com>,
 James Morris <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Dave Chinner
 <david@...morbit.com>, Qi Zheng <zhengqi.arch@...edance.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Muchun Song <muchun.song@...ux.dev>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
 Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
 Gary Guo <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>,
 Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>,
 Danilo Krummrich <dakr@...nel.org>, kernel-team@...roid.com,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-security-module@...r.kernel.org, linux-mm@...ck.org,
 rust-for-linux@...r.kernel.org
Subject: Re: [PATCH 3/5] mm: export zap_page_range_single and list_lru_add/del

On 2/5/26 13:10, Lorenzo Stoakes wrote:
> On Thu, Feb 05, 2026 at 11:58:00AM +0000, Alice Ryhl wrote:
>> On Thu, Feb 05, 2026 at 12:43:03PM +0100, David Hildenbrand (arm) wrote:
>>>
>>> I don't expect anybody to set zap_details, but yeah, it could be abused.
>>> It could be abused right now from anywhere else in the kernel
>>> where we don't build as a module :)
>>>
>>> Apparently we export a similar function in rust where we just removed the last parameter.
>>
>> To clarify, said Rust function gets inlined into Rust Binder, so Rust
>> Binder calls the zap_page_range_single() symbol directly.
> 
> Presumably only for things compiled into the kernel right?

Could Rust just use zap_vma_ptes() or does it want to zap things in VMAs 
that are not VM_PFNMAP?

-- 
Cheers,

David