linux-kernel - Re: [PATCH 34/40] drm/amd/display/amdgpu_dm/amdgpu_dm_helpers: Use 'gnu

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Date:   Tue, 1 Dec 2020 14:41:14 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Christian König <christian.koenig@....com>
Cc:     Lee Jones <lee.jones@...aro.org>, Leo Li <sunpeng.li@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        Alex Deucher <alexander.deucher@....com>
Subject: Re: [PATCH 34/40] drm/amd/display/amdgpu_dm/amdgpu_dm_helpers: Use
 'gnu_printf' format notation

On Tue, Dec 1, 2020 at 1:59 PM Christian König <christian.koenig@....com> wrote:
>
> Am 01.12.20 um 19:42 schrieb Alex Deucher:
> > On Thu, Nov 26, 2020 at 8:44 AM Lee Jones <lee.jones@...aro.org> 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@....com>
> >> Cc: Leo Li <sunpeng.li@....com>
> >> Cc: Alex Deucher <alexander.deucher@....com>
> >> Cc: "Christian König" <christian.koenig@....com>
> >> Cc: David Airlie <airlied@...ux.ie>
> >> Cc: Daniel Vetter <daniel@...ll.ch>
> >> Cc: amd-gfx@...ts.freedesktop.org
> >> Cc: dri-devel@...ts.freedesktop.org
> >> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> >> ---
> >>   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?
>
> Been a while since I looked into something like this, but IIRC this
> means that parameter 3 (msg) is considered a printf format string and
> the types of parameter 4 and following checked against that.
>
> Looks correct to me.

Thanks.  Applied.

Alex


>
> Christian.
>
> >
> > Alex
> >
> >>   void dm_dtn_log_append_v(struct dc_context *ctx,
> >>          struct dc_log_buffer_ctx *log_ctx,
> >>          const char *msg, ...)
> >> --
> >> 2.25.1
> >>
> >> _______________________________________________
> >> dri-devel mailing list
> >> dri-devel@...ts.freedesktop.org
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