(Cc: stable@vger.kernel.org)

On Thu Dec 4, 2025 at 5:06 PM CET, FUJITA Tomonori wrote:

Add dma_set_mask(), dma_set_coherent_mask(), dma_map_sgtable(), and dma_max_mapping_size() helpers to fix a build error when CONFIG_HAS_DMA is not enabled.

Note that when CONFIG_HAS_DMA is enabled, they 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_set_mask` in crate `bindings` --> /linux/rust/kernel/dma.rs:46:38 | 46 | to_result(unsafe { bindings::dma_set_mask(self.as_ref().as_raw(), mask.value()) }) | ^^^^^^^^^^^^ help: a function with a similar name exists: `xa_set_mark` | ::: /build/um/rust/bindings/bindings_generated.rs:24690:5 | 24690 | pub fn xa_set_mark(arg1: *mut xarray, index: ffi::c_ulong, arg2: xa_mark_t); | ---------------------------------------------------------------------------- similarly named function `xa_set_mark` defined here

error[E0425]: cannot find function `dma_set_coherent_mask` in crate `bindings` --> /linux/rust/kernel/dma.rs:63:38 | 63 | to_result(unsafe { bindings::dma_set_coherent_mask(self.as_ref().as_raw(), mask.value()) }) | ^^^^^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `dma_coherent_ok` | ::: /build/um/rust/bindings/bindings_generated.rs:52745:5 | 52745 | pub fn dma_coherent_ok(dev: *mut device, phys: phys_addr_t, size: usize) -> bool_; | ---------------------------------------------------------------------------------- similarly named function `dma_coherent_ok` defined here

error[E0425]: cannot find function `dma_map_sgtable` in crate `bindings` --> /linux/rust/kernel/scatterlist.rs:212:23 | 212 | bindings::dma_map_sgtable(dev.as_raw(), sgt.as_ptr(), dir.into(), 0) | ^^^^^^^^^^^^^^^ help: a function with a similar name exists: `dma_unmap_sgtable` | ::: /build/um/rust/bindings/bindings_helpers_generated.rs:1351:5 | 1351 | / pub fn dma_unmap_sgtable( 1352 | | dev: *mut device, 1353 | | sgt: *mut sg_table, 1354 | | dir: dma_data_direction, 1355 | | attrs: ffi::c_ulong, 1356 | | ); | |______- similarly named function `dma_unmap_sgtable` defined here

error[E0425]: cannot find function `dma_max_mapping_size` in crate `bindings` --> /linux/rust/kernel/scatterlist.rs:356:52 | 356 | let max_segment = match unsafe { bindings::dma_max_mapping_size(dev.as_raw()) } { | ^^^^^^^^^^^^^^^^^^^^ not found in `bindings`

error: aborting due to 4 previous errors

Fixes: 101d66828a4ee ("rust: dma: add DMA addressing capabilities") Signed-off-by: FUJITA Tomonori fujita.tomonori@gmail.com

Applied to driver-core-linus, thanks!

[ Use relative paths in the error splat; add 'dma' prefix. - Danilo ]