Re: [PATCH 34/40] drm/amd/display/amdgpu_dm/amdgpu_dm_helpers: Use 'gnu_printf' format notation

[Alex Deucher]

On Thu, Nov 26, 2020 at 8:44 AM Lee Jones <lee.jones@xxxxxxxxxx> wrote:
>
> Fixes the following W=1 kernel build warning(s):
>
>  drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_helpers.c: In function ‘dm_dtn_log_append_v’:
>  drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_helpers.c:345:2: warning: function ‘dm_dtn_log_append_v’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
>  drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_helpers.c:375:3: warning: function ‘dm_dtn_log_append_v’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
>
> Cc: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: Leo Li <sunpeng.li@xxxxxxx>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: "Christian König" <christian.koenig@xxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> index b7d7ec3ba00d7..24a81642baa26 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> @@ -318,6 +318,7 @@ void dm_dtn_log_begin(struct dc_context *ctx,
>         dm_dtn_log_append_v(ctx, log_ctx, "%s", msg);
>  }
>
> +__printf(3, 4)

Can you expand a bit on what this does?

Alex

>  void dm_dtn_log_append_v(struct dc_context *ctx,
>         struct dc_log_buffer_ctx *log_ctx,
>         const char *msg, ...)
> --
> 2.25.1
>
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