Re: [PATCH 14/14] drm/amd/pm: Replace one-element array with flexible-array in struct ATOM_Vega10_GFXCLK_Dependency_Table

Alex Deucher
2020-10-08T15:46:36Z

On Wed, Oct 7, 2020 at 12:05 PM Gustavo A. R. Silva
<gustavoars@kernel.org> wrote:
>
> There is a regular need in the kernel to provide a way to declare having
> a dynamically sized set of trailing elements in a structure. Kernel code
> should always use “flexible array members”[1] for these cases. The older
> style of one-element or zero-length arrays should no longer be used[2].
>
> Use a flexible-array member in struct ATOM_Vega10_GFXCLK_Dependency_Table
> instead of a one-element array.
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length-and-one-element-arrays
>
> Build-tested-by: kernel test robot <lkp@intel.com>
> Link: https://lore.kernel.org/lkml/5f7d61dd.O8jxxI5C6P9FOb%2Fd%25lkp@intel.com/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

This header is shared with firmware, so I'm leaving it as is for consistency.

Alex

> ---
> drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h
> index c934e9612c1b..a6968009acc4 100644
> --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h
> +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_pptable.h
> @@ -163,7 +163,7 @@ typedef struct _ATOM_Vega10_MCLK_Dependency_Record {
> typedef struct _ATOM_Vega10_GFXCLK_Dependency_Table {
> UCHAR ucRevId;
> UCHAR ucNumEntries; /* Number of entries. */
> - ATOM_Vega10_GFXCLK_Dependency_Record entries[1]; /* Dynamically allocate entries. */
> + ATOM_Vega10_GFXCLK_Dependency_Record entries[]; /* Dynamically allocate entries. */
> } ATOM_Vega10_GFXCLK_Dependency_Table;
>
> typedef struct _ATOM_Vega10_MCLK_Dependency_Table {
> --
> 2.27.0
>
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