linux-kernel - Re: [PATCH] arm64: hw_breakpoint: mark expected switch fall-through

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Message-ID: <CAGnkfhx1r_wE9d9DLKYznhFw43bYWx5A23MnLy9X4T_bZAmjKA@mail.gmail.com>
Date:   Mon, 29 Jul 2019 01:36:53 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: hw_breakpoint: mark expected switch fall-through

Feel free di discard the patch then.
What compiler are you using? I' using gcc version 8.3.0 (Ubuntu/Linaro
8.3.0-6ubuntu1)

On Mon, Jul 29, 2019 at 1:34 AM Gustavo A. R. Silva
<gustavo@...eddedor.com> wrote:
>
> Hi Matteo,
>
> I sent a patch for this some minutes ago:
>
> https://lore.kernel.org/patchwork/patch/1106585/
>
> It seems there are more warnings in that file than the ones you are
> addressing.
>
> Thanks
> --
> Gustavo
>
> On 7/28/19 6:27 PM, Matteo Croce wrote:
> > Mark switch cases where we are expecting to fall through,
> > fixes the following warning:
> >
> >   CC      arch/arm64/kernel/hw_breakpoint.o
> > arch/arm64/kernel/hw_breakpoint.c: In function ‘hw_breakpoint_arch_parse’:
> > arch/arm64/kernel/hw_breakpoint.c:540:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >     if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1)
> >        ^
> > arch/arm64/kernel/hw_breakpoint.c:542:3: note: here
> >    case 2:
> >    ^~~~
> > arch/arm64/kernel/hw_breakpoint.c:544:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >     if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2)
> >        ^
> > arch/arm64/kernel/hw_breakpoint.c:546:3: note: here
> >    default:
> >    ^~~~~~~
> >
> > Signed-off-by: Matteo Croce <mcroce@...hat.com>
> > ---
> >  arch/arm64/kernel/hw_breakpoint.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
> > index dceb84520948..7d846985b133 100644
> > --- a/arch/arm64/kernel/hw_breakpoint.c
> > +++ b/arch/arm64/kernel/hw_breakpoint.c
> > @@ -539,10 +539,12 @@ int hw_breakpoint_arch_parse(struct perf_event *bp,
> >                       /* Allow single byte watchpoint. */
> >                       if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1)
> >                               break;
> > +                     /* fallthrough */
> >               case 2:
> >                       /* Allow halfword watchpoints and breakpoints. */
> >                       if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2)
> >                               break;
> > +                     /* fallthrough */
> >               default:
> >                       return -EINVAL;
> >               }
> >



-- 
Matteo Croce
per aspera ad upstream