Re: [PATCH] Docs/mm: fix documentation warning for GFP parameter in kmalloc_obj, kmalloc_objs and kmalloc_flex

Harry Yoo <[email protected]> Mon, 22 Jun 2026 16:27:28 +0900

Newsgroups	dev.linux.lists.linux-kernel-mentees,org.kernel.vger.linux-kernel,org.kvack.linux-mm
Message-ID	<[email protected]>


On 6/19/26 8:36 PM, Jakov Novak wrote:
> Compiling the documentation currently gives the errors:
> 
> WARNING: ./include/linux/slab.h:1100 Excess function parameter 'GFP' description in 'kmalloc_obj'
> WARNING: ./include/linux/slab.h:1112 Excess function parameter 'GFP' description in 'kmalloc_objs'
> WARNING: ./include/linux/slab.h:1127 Excess function parameter 'GFP' description in 'kmalloc_flex'
> WARNING: ./include/linux/slab.h:1100 Excess function parameter 'GFP' description in 'kmalloc_obj'
> WARNING: ./include/linux/slab.h:1112 Excess function parameter 'GFP' description in 'kmalloc_objs'
> WARNING: ./include/linux/slab.h:1127 Excess function parameter 'GFP' description in 'kmalloc_flex'
> 
> This effectively omits the GFP parameter from the current kernel
> documentation. This patch marks the "..." parameter with the previous
> description of the GFP parameter along with an "optional" tag in
> parantheses.
> 
> Signed-off-by: Jakov Novak <[email protected]>

Hi Jakov, thanks for the patch!

For your information, Randy Dunlap already fixed this issue [1] and it
is queued to slab/for-next [2].

[1]
https://lore.kernel.org/all/[email protected]/
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git/commit/?h=slab/for-next&id=7b5f5865fb11e60edd03c5e063e2d228b7062317

> ---
>  include/linux/slab.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index d4a873a16289..ee952784a150 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -1093,7 +1093,7 @@ void *kmalloc_nolock(size_t size, gfp_t gfp_flags, int node);
>  /**
>   * kmalloc_obj - Allocate a single instance of the given type
>   * @VAR_OR_TYPE: Variable or type to allocate.
> - * @GFP: GFP flags for the allocation.
> + * @...: GFP flags for the allocation (optional).
>   *
>   * Returns: newly allocated pointer to a @VAR_OR_TYPE on success, or NULL
>   * on failure.
> @@ -1105,7 +1105,7 @@ void *kmalloc_nolock(size_t size, gfp_t gfp_flags, int node);
>   * kmalloc_objs - Allocate an array of the given type
>   * @VAR_OR_TYPE: Variable or type to allocate an array of.
>   * @COUNT: How many elements in the array.
> - * @GFP: GFP flags for the allocation.
> + * @...: GFP flags for the allocation (optional).
>   *
>   * Returns: newly allocated pointer to array of @VAR_OR_TYPE on success,
>   * or NULL on failure.
> @@ -1118,7 +1118,7 @@ void *kmalloc_nolock(size_t size, gfp_t gfp_flags, int node);
>   * @VAR_OR_TYPE: Variable or type to allocate (with its flex array).
>   * @FAM: The name of the flexible array member of the structure.
>   * @COUNT: How many flexible array member elements are desired.
> - * @GFP: GFP flags for the allocation.
> + * @...: GFP flags for the allocation (optional).
>   *
>   * Returns: newly allocated pointer to @VAR_OR_TYPE on success, NULL on
>   * failure. If @FAM has been annotated with __counted_by(), the allocation

-- 
Cheers,
Harry / Hyeonggon

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