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

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Message-ID: <CADnq5_PX2LokA0VgC-NLZfCa=k8vc9PWYX5WWVH5RCsEzZc+BQ@mail.gmail.com>
Date:   Thu, 8 Oct 2020 11:46:20 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        linux-hardening@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH 14/14] drm/amd/pm: Replace one-element array with
 flexible-array in struct ATOM_Vega10_GFXCLK_Dependency_Table

On Wed, Oct 7, 2020 at 12:05 PM Gustavo A. R. Silva
<gustavoars@...nel.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@...el.com>
> Link: https://lore.kernel.org/lkml/5f7d61dd.O8jxxI5C6P9FOb%2Fd%25lkp@intel.com/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.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
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx

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