linux-hardening - Re: [PATCH 060/141] habanalabs: Fix fall-through warnings for Clang

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Message-ID: <CAFCwf11izHF=g1mGry1fE5kvFFFrxzhPSM6qKAO8gxSp=Kr_CQ@mail.gmail.com>
Date:   Sat, 21 Nov 2020 14:34:23 +0200
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 060/141] habanalabs: Fix fall-through warnings for Clang

On Fri, Nov 20, 2020 at 8:33 PM Gustavo A. R. Silva
<gustavoars@...nel.org> wrote:
>
> In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning
> by explicitly adding a fallthrough pseudo-keyword instead of letting the
> code fall through to the next case.
>
> Link: https://github.com/KSPP/linux/issues/115
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  drivers/misc/habanalabs/gaudi/gaudi.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
> index 2519a34e25b7..eab4c0dc65c5 100644
> --- a/drivers/misc/habanalabs/gaudi/gaudi.c
> +++ b/drivers/misc/habanalabs/gaudi/gaudi.c
> @@ -5436,6 +5436,7 @@ static void gaudi_handle_ecc_event(struct hl_device *hdev, u16 event_type,
>                 params.num_memories = 33;
>                 params.derr = true;
>                 params.disable_clock_gating = true;
> +               fallthrough;
>         default:
>                 return;
>         }
> --
> 2.27.0
>
Hi Gustavo,
So this is actually an error in the code, there shouldn't be a
fallthrough there.
So NAK for this patch, I'll have to send a fix for that.
Thanks for catching this :)

Oded