linux-kernel - Re: [PATCH][next] drm/amd/display: Fix fall-through warning for Clang

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Message-ID: <CADnq5_MZ7vTxH6aB-rsZqSLGaffi6OwgVBDAFcT=16RRNw+UKA@mail.gmail.com>
Date:   Fri, 18 Jun 2021 16:36:02 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Harry Wentland <harry.wentland@....com>
Cc:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-hardening@...r.kernel.org,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] drm/amd/display: Fix fall-through warning for Clang

Applied.  Thanks!

Alex

On Thu, Jun 17, 2021 at 3:20 PM Harry Wentland <harry.wentland@....com> wrote:
>
>
>
> On 2021-06-16 4:52 p.m., Gustavo A. R. Silva wrote:
> > In preparation to enable -Wimplicit-fallthrough for Clang, fix
> > the following warning by replacing a /* fall through */ comment
> > with the new pseudo-keyword macro fallthrough:
> >
> > rivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_aux.c:672:4: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
> >                         case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER:
> >                         ^
> >
> > Notice that Clang doesn't recognize /* fall through */ comments as
> > implicit fall-through markings, so in order to globally enable
> > -Wimplicit-fallthrough for Clang, these comments need to be
> > replaced with fallthrough; in the whole codebase.
> >
> > Link: https://github.com/KSPP/linux/issues/115
> > Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
>
> Reviewed-by: Harry Wentland <harry.wentland@....com>
>
> Harry
>
> > ---
> > JFYI: We had thousands of these sorts of warnings and now we are down
> >       to just 15 in linux-next. This is one of those last remaining
> >       warnings.
> >
> >  drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> > index 28631714f697..2fb88e54a4bf 100644
> > --- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> > +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> > @@ -668,7 +668,7 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
> >                               /* polling_timeout_period is in us */
> >                               defer_time_in_ms += aux110->polling_timeout_period / 1000;
> >                               ++aux_defer_retries;
> > -                             /* fall through */
> > +                             fallthrough;
> >                       case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER:
> >                               retry_on_defer = true;
> >                               fallthrough;
> >
>