linux-kernel - Re: [PATCH] rust: alloc: add GFP

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Message-ID: <87a4xxsciw.fsf@t14s.mail-host-address-is-not-set>
Date: Wed, 28 Jan 2026 21:33:27 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Danilo Krummrich <dakr@...nel.org>
Cc: 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>, Alice
 Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, Lorenzo
 Stoakes <lorenzo.stoakes@...cle.com>, Vlastimil Babka <vbabka@...e.cz>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Uladzislau Rezki
 <urezki@...il.com>, rust-for-linux@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rust: alloc: add GFP_NOIO flag

"Danilo Krummrich" <dakr@...nel.org> writes:

> On Wed Jan 28, 2026 at 7:37 PM CET, Andreas Hindborg wrote:
>> +    /// [`GFP_NOIO`] will use direct reclaim to discard clean pages or slab
>> +    /// pages that do not require the starting of any physical IO.
>> +    pub const GFP_NOIO: Flags = Flags(bindings::GFP_NOIO);
>
> How do you use this? What about abstractions for memalloc_noio_{save,restore}()
> instead?

I use it to allocate memory for backing storage in rust null block. The
allocation is done during processing of disk IO:

                page: Page::alloc_page(GFP_NOIO | __GFP_ZERO)?,

Best regards,
Andreas Hindborg