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

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Message-Id: <20260128-gfp-noio-v1-1-9a808fc49b44@kernel.org>
Date: Wed, 28 Jan 2026 19:37:12 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: 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>, Danilo Krummrich <dakr@...nel.org>, 
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
 Vlastimil Babka <vbabka@...e.cz>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Uladzislau Rezki <urezki@...il.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Andreas Hindborg <a.hindborg@...nel.org>
Subject: [PATCH] rust: alloc: add GFP_NOIO flag

Add an abstraction for the `GFP_NOIO` flag. This flag signals that the
caller requires allocation to complete without triggering any block device
IO.

Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 rust/bindings/bindings_helper.h | 1 +
 rust/kernel/alloc.rs            | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
index a067038b4b422..3910ecc5c34cf 100644
--- a/rust/bindings/bindings_helper.h
+++ b/rust/bindings/bindings_helper.h
@@ -106,6 +106,7 @@ const size_t RUST_CONST_HELPER_PAGE_SIZE = PAGE_SIZE;
 const gfp_t RUST_CONST_HELPER_GFP_ATOMIC = GFP_ATOMIC;
 const gfp_t RUST_CONST_HELPER_GFP_KERNEL = GFP_KERNEL;
 const gfp_t RUST_CONST_HELPER_GFP_KERNEL_ACCOUNT = GFP_KERNEL_ACCOUNT;
+const gfp_t RUST_CONST_HELPER_GFP_NOIO = GFP_NOIO;
 const gfp_t RUST_CONST_HELPER_GFP_NOWAIT = GFP_NOWAIT;
 const gfp_t RUST_CONST_HELPER___GFP_ZERO = __GFP_ZERO;
 const gfp_t RUST_CONST_HELPER___GFP_HIGHMEM = ___GFP_HIGHMEM;
diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs
index e38720349dcf7..5f6a0f7e99c03 100644
--- a/rust/kernel/alloc.rs
+++ b/rust/kernel/alloc.rs
@@ -99,6 +99,10 @@ pub mod flags {
     /// The same as [`GFP_KERNEL`], except the allocation is accounted to kmemcg.
     pub const GFP_KERNEL_ACCOUNT: Flags = Flags(bindings::GFP_KERNEL_ACCOUNT);

+    /// [`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);
+
     /// For kernel allocations that should not stall for direct reclaim, start physical IO or
     /// use any filesystem callback.  It is very likely to fail to allocate memory, even for very
     /// small allocations.

---
base-commit: 63804fed149a6750ffd28610c5c1c98cce6bd377
change-id: 20260128-gfp-noio-fbd41e135088

Best regards,
-- 
Andreas Hindborg <a.hindborg@...nel.org>