linux-kernel - Re: [PATCH] drivers: gpu: Fix warning using plain integer as NULL

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Message-ID: <87sf5jyvkt.fsf@intel.com>
Date:   Mon, 06 Nov 2023 13:23:14 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Abhinav Singh <singhabhinav9051571833@...il.com>,
        alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch
Cc:     Abhinav Singh <singhabhinav9051571833@...il.com>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: gpu: Fix warning using plain integer as NULL

On Fri, 03 Nov 2023, Abhinav Singh <singhabhinav9051571833@...il.com> wrote:
> sparse static analysis tools generate a warning with this message
> "Using plain integer as NULL pointer". In this case this warning is
> being shown because we are trying to intialize a pointer to NULL using
> integer value 0.
>
> Signed-off-by: Abhinav Singh <singhabhinav9051571833@...il.com>
> ---
>  drivers/gpu/drm/radeon/clearstate_evergreen.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/clearstate_evergreen.h b/drivers/gpu/drm/radeon/clearstate_evergreen.h
> index 63a1ffbb3ced..3b645558f133 100644
> --- a/drivers/gpu/drm/radeon/clearstate_evergreen.h
> +++ b/drivers/gpu/drm/radeon/clearstate_evergreen.h
> @@ -1049,7 +1049,7 @@ static const struct cs_extent_def SECT_CONTEXT_defs[] =
>      {SECT_CONTEXT_def_5, 0x0000a29e, 5 },
>      {SECT_CONTEXT_def_6, 0x0000a2a5, 56 },
>      {SECT_CONTEXT_def_7, 0x0000a2de, 290 },
> -    { 0, 0, 0 }
> +    { NULL, 0, 0 }

Random drive-by comment:

I'd just use {} as the sentinel.

BR,
Jani.

>  };
>  static const u32 SECT_CLEAR_def_1[] =
>  {
> @@ -1060,7 +1060,7 @@ static const u32 SECT_CLEAR_def_1[] =
>  static const struct cs_extent_def SECT_CLEAR_defs[] =
>  {
>      {SECT_CLEAR_def_1, 0x0000ffc0, 3 },
> -    { 0, 0, 0 }
> +    { NULL, 0, 0 }
>  };
>  static const u32 SECT_CTRLCONST_def_1[] =
>  {
> @@ -1070,11 +1070,11 @@ static const u32 SECT_CTRLCONST_def_1[] =
>  static const struct cs_extent_def SECT_CTRLCONST_defs[] =
>  {
>      {SECT_CTRLCONST_def_1, 0x0000f3fc, 2 },
> -    { 0, 0, 0 }
> +    { NULL, 0, 0 }
>  };
>  static const struct cs_section_def evergreen_cs_data[] = {
>      { SECT_CONTEXT_defs, SECT_CONTEXT },
>      { SECT_CLEAR_defs, SECT_CLEAR },
>      { SECT_CTRLCONST_defs, SECT_CTRLCONST },
> -    { 0, SECT_NONE }
> +    { NULL, SECT_NONE }
>  };
> --
> 2.39.2
>

-- 
Jani Nikula, Intel