Re: [PATCH v12 4/4] rust: support large alignments in allocations

[Danilo Krummrich <dakr@kernel.org>]

On Wed, Jul 09, 2025 at 07:25:09PM +0200, Vitaly Wool wrote:
>  void * __must_check __realloc_size(2)
> -rust_helper_krealloc_node(const void *objp, size_t new_size, gfp_t flags, int node)
> +rust_helper_krealloc_node_align(const void *objp, size_t new_size, unsigned long align,
> +				gfp_t flags, int node)

CHECK: Alignment should match open parenthesis
#38: FILE: rust/helpers/slab.c:14:
+rust_helper_kvrealloc_node_align(const void *p, size_t size, unsigned long align,
+                               gfp_t flags, int node)

total: 0 errors, 0 warnings, 1 checks, 94 lines checked

Please make sure to always run scripts/checkpatch.pl. :)

> @@ -185,12 +180,6 @@ unsafe fn realloc(
>          flags: Flags,
>          nid: NumaNode,
>      ) -> Result<NonNull<[u8]>, AllocError> {
> -        // TODO: Support alignments larger than PAGE_SIZE.
> -        if layout.align() > bindings::PAGE_SIZE {
> -            pr_warn!("KVmalloc does not support alignments larger than PAGE_SIZE yet.\n");
> -            return Err(AllocError);
> -        }
> -

Since you remove the pr_warn!(), you also have to remove the corresponding
import, otherwise you get a clippy warning.

Please build with CLIPPY=1, see also [1].

[1] https://rust-for-linux.com/contributing#submit-checklist-addendum