linux-kernel - Re: [PATCH v2] rust: helpers: Add dma_alloc_attrs() and dma_free

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Message-ID: <Z_jmBz6FBoYMMGyi@cassiopeiae>
Date: Fri, 11 Apr 2025 11:51:03 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: rust-for-linux@...r.kernel.org, abdiel.janulgue@...il.com,
	daniel.almeida@...labora.com, robin.murphy@....com,
	a.hindborg@...nel.org, ojeda@...nel.org, alex.gaynor@...il.com,
	boqun.feng@...il.com, gary@...yguo.net, bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me, aliceryhl@...gle.com, tmgross@...ch.edu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] rust: helpers: Add dma_alloc_attrs() and
 dma_free_attrs()

On Fri, Apr 11, 2025 at 08:43:32AM +0900, FUJITA Tomonori wrote:
> Add dma_alloc_attrs() and dma_free_attrs() helpers to fix a build
> error when CONFIG_HAS_DMA is not enabled.
> 
> Note that when CONFIG_HAS_DMA is enabled, dma_alloc_attrs() and
> dma_free_attrs() are included in both bindings_generated.rs and
> bindings_helpers_generated.rs. The former takes precedence so behavior
> remains unchanged in that case.
> 
> This fixes the following build error on UML:
> 
> error[E0425]: cannot find function `dma_alloc_attrs` in crate `bindings`
>      --> rust/kernel/dma.rs:171:23
>       |
> 171   |               bindings::dma_alloc_attrs(
>       |                         ^^^^^^^^^^^^^^^ help: a function with a similar name exists: `dma_alloc_pages`
>       |
>      ::: /home/fujita/build/um/rust/bindings/bindings_generated.rs:44568:5
>       |
> 44568 | /     pub fn dma_alloc_pages(
> 44569 | |         dev: *mut device,
> 44570 | |         size: usize,
> 44571 | |         dma_handle: *mut dma_addr_t,
> 44572 | |         dir: dma_data_direction,
> 44573 | |         gfp: gfp_t,
> 44574 | |     ) -> *mut page;
>       | |___________________- similarly named function `dma_alloc_pages` defined here
> 
> error[E0425]: cannot find function `dma_free_attrs` in crate `bindings`
>      --> rust/kernel/dma.rs:293:23
>       |
> 293   |               bindings::dma_free_attrs(
>       |                         ^^^^^^^^^^^^^^ help: a function with a similar name exists: `dma_free_pages`
>       |
>      ::: /home/fujita/build/um/rust/bindings/bindings_generated.rs:44577:5
>       |
> 44577 | /     pub fn dma_free_pages(
> 44578 | |         dev: *mut device,
> 44579 | |         size: usize,
> 44580 | |         page: *mut page,
> 44581 | |         dma_handle: dma_addr_t,
> 44582 | |         dir: dma_data_direction,
> 44583 | |     );
>       | |______- similarly named function `dma_free_pages` defined here
> 
> Fixes: ad2907b4e308 ("rust: add dma coherent allocator abstraction")
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>

Please add the new file to the corresponding MAINTAINERS entry. Whith that,

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