linux-kernel - Re: [PATCH v7 08/26] rust: alloc: add __GFP

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Message-ID: <20240928195535.302097c2.gary@garyguo.net>
Date: Sat, 28 Sep 2024 19:55:35 +0100
From: Gary Guo <gary@...yguo.net>
To: Danilo Krummrich <dakr@...nel.org>
Cc: ojeda@...nel.org, alex.gaynor@...il.com, wedsonaf@...il.com,
 boqun.feng@...il.com, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me,
 a.hindborg@...sung.com, aliceryhl@...gle.com, akpm@...ux-foundation.org,
 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,
 ajanulgu@...hat.com, lyude@...hat.com, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v7 08/26] rust: alloc: add __GFP_NOWARN to `Flags`

On Thu, 12 Sep 2024 00:52:44 +0200
Danilo Krummrich <dakr@...nel.org> wrote:

> 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>
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>

Reviewed-by: Gary Guo <gary@...yguo.net>

> ---
>  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 da025faf07f8..7a405d6f3034 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.