linux-kernel - Re: [PATCH 3/3] powerpc: fix -Wimplicit-fallthrough

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Message-ID: <20201117030234.GC1340689@ubuntu-m3-large-x86>
Date:   Mon, 16 Nov 2020 20:02:34 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        clang-built-linux@...glegroups.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] powerpc: fix -Wimplicit-fallthrough

On Sun, Nov 15, 2020 at 08:35:32PM -0800, Nick Desaulniers wrote:
> The "fallthrough" pseudo-keyword was added as a portable way to denote
> intentional fallthrough. Clang will still warn on cases where there is a
> fallthrough to an immediate break. Add explicit breaks for those cases.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/236
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
Tested-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  arch/powerpc/kernel/prom_init.c | 1 +
>  arch/powerpc/kernel/uprobes.c   | 1 +
>  arch/powerpc/perf/imc-pmu.c     | 1 +
>  3 files changed, 3 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
> index 38ae5933d917..e9d4eb6144e1 100644
> --- a/arch/powerpc/kernel/prom_init.c
> +++ b/arch/powerpc/kernel/prom_init.c
> @@ -355,6 +355,7 @@ static int __init prom_strtobool(const char *s, bool *res)
>  		default:
>  			break;
>  		}
> +		break;
>  	default:
>  		break;
>  	}
> diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c
> index d200e7df7167..e8a63713e655 100644
> --- a/arch/powerpc/kernel/uprobes.c
> +++ b/arch/powerpc/kernel/uprobes.c
> @@ -141,6 +141,7 @@ int arch_uprobe_exception_notify(struct notifier_block *self,
>  	case DIE_SSTEP:
>  		if (uprobe_post_sstep_notifier(regs))
>  			return NOTIFY_STOP;
> +		break;
>  	default:
>  		break;
>  	}
> diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
> index 7b25548ec42b..e106909ff9c3 100644
> --- a/arch/powerpc/perf/imc-pmu.c
> +++ b/arch/powerpc/perf/imc-pmu.c
> @@ -1500,6 +1500,7 @@ static int update_pmu_ops(struct imc_pmu *pmu)
>  		pmu->pmu.stop = trace_imc_event_stop;
>  		pmu->pmu.read = trace_imc_event_read;
>  		pmu->attr_groups[IMC_FORMAT_ATTR] = &trace_imc_format_group;
> +		break;
>  	default:
>  		break;
>  	}
> -- 
> 2.29.2.299.gdc1121823c-goog
>