linux-kernel - Re: [PATCH] drm/msm/dp: Add a missing semi-colon

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Date:   Mon, 08 Feb 2021 10:57:07 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Joe Perches <joe@...ches.com>, Rob Clark <robdclark@...il.com>
Cc:     linux-kernel@...r.kernel.org, Sean Paul <sean@...rly.run>,
        Kuogee Hsieh <khsieh@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH] drm/msm/dp: Add a missing semi-colon

Quoting Joe Perches (2021-02-06 21:06:54)
> On Sat, 2021-02-06 at 20:18 -0800, Stephen Boyd wrote:
> > A missing semicolon here causes my external display to stop working.
> > Indeed, missing the semicolon on the return statement leads to
> > dp_panel_update_tu_timings() not existing because the compiler thinks
> > it's part of the return statement of a void function, so it must not be
> > important.
> > 
> >   $ ./scripts/bloat-o-meter before.o after.o
> >   add/remove: 1/1 grow/shrink: 0/1 up/down: 7400/-7540 (-140)
> >   Function                                     old     new   delta
> >   dp_panel_update_tu_timings                     -    7400   +7400
> >   _dp_ctrl_calc_tu.constprop                 18024   17900    -124
> >   dp_panel_update_tu_timings.constprop        7416       -   -7416
> >   Total: Before=54440, After=54300, chg -0.26%
> > 
> > Add a semicolon so this function works like it used to.
> []
> > diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
> []
> > @@ -631,7 +631,7 @@ static void _dp_ctrl_calc_tu(struct dp_tu_calc_input *in,
> >  
> > 
> >       tu = kzalloc(sizeof(*tu), GFP_KERNEL);
> >       if (!tu)
> > -             return
> > +             return;
> >  
> > 
> >       dp_panel_update_tu_timings(in, tu);
> 
> Wow, that's really unfortunate that dp_panel_update_tu_timings
> is also void.
> 
> Perhaps this as YA checkpatch warning:
> 
> ---

Acked-by: Stephen Boyd <swboyd@...omium.org>