linux-kernel - [PATCH v9 10/29] rust: alloc: add __GFP

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Message-ID: <20241004154149.93856-11-dakr@kernel.org>
Date: Fri,  4 Oct 2024 17:41:14 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: ojeda@...nel.org,
	alex.gaynor@...il.com,
	wedsonaf@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...sung.com,
	aliceryhl@...gle.com,
	akpm@...ux-foundation.org
Cc: daniel.almeida@...labora.com,
	faith.ekstrand@...labora.com,
	boris.brezillon@...labora.com,
	lina@...hilina.net,
	mcanal@...lia.com,
	zhiw@...dia.com,
	cjia@...dia.com,
	jhubbard@...dia.com,
	airlied@...hat.com,
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	lyude@...hat.com,
	linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	linux-mm@...ck.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH v9 10/29] rust: alloc: add __GFP_NOWARN to `Flags`

Some test cases in subsequent patches provoke allocation failures. Add
`__GFP_NOWARN` to enable test cases to silence unpleasant warnings.

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
Reviewed-by: Gary Guo <gary@...yguo.net>
Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 rust/bindings/bindings_helper.h | 1 +
 rust/kernel/alloc.rs            | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
index ae82e9c941af..a80783fcbe04 100644
--- a/rust/bindings/bindings_helper.h
+++ b/rust/bindings/bindings_helper.h
@@ -31,4 +31,5 @@ const gfp_t RUST_CONST_HELPER_GFP_KERNEL_ACCOUNT = GFP_KERNEL_ACCOUNT;
 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;
+const gfp_t RUST_CONST_HELPER___GFP_NOWARN = ___GFP_NOWARN;
 const blk_features_t RUST_CONST_HELPER_BLK_FEAT_ROTATIONAL = BLK_FEAT_ROTATIONAL;
diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs
index f8ddc8d96da9..97defee1d6a1 100644
--- a/rust/kernel/alloc.rs
+++ b/rust/kernel/alloc.rs
@@ -91,6 +91,11 @@ pub mod flags {
     /// use any filesystem callback.  It is very likely to fail to allocate memory, even for very
     /// small allocations.
     pub const GFP_NOWAIT: Flags = Flags(bindings::GFP_NOWAIT);
+
+    /// Suppresses allocation failure reports.
+    ///
+    /// This is normally or'd with other flags.
+    pub const __GFP_NOWARN: Flags = Flags(bindings::__GFP_NOWARN);
 }
 
 /// The kernel's [`Allocator`] trait.
-- 
2.46.1