linux-kernel - Re: [oss-drivers] [trivial PATCH] treewide: Convert switch/case fallthrough; to break;

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Message-ID: <20200917080334.GB5769@netronome.com>
Date:   Thu, 17 Sep 2020 10:03:35 +0200
From:   Simon Horman <simon.horman@...ronome.com>
To:     Joe Perches <joe@...ches.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Jiri Kosina <trivial@...nel.org>,
        Kees Cook <kees.cook@...onical.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-mips@...r.kernel.org, linux-s390@...r.kernel.org,
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        linux-mtd@...ts.infradead.org, intel-wired-lan@...ts.osuosl.org,
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Subject: Re: [oss-drivers] [trivial PATCH] treewide: Convert switch/case
 fallthrough; to break;

On Wed, Sep 09, 2020 at 01:06:39PM -0700, Joe Perches wrote:
> fallthrough to a separate case/default label break; isn't very readable.
> 
> Convert pseudo-keyword fallthrough; statements to a simple break; when
> the next label is case or default and the only statement in the next
> label block is break;
> 
> Found using:
> 
> $ grep-2.5.4 -rP --include=*.[ch] -n "fallthrough;(\s*(case\s+\w+|default)\s*:\s*){1,7}break;" *
> 
> Miscellanea:
> 
> o Move or coalesce a couple label blocks above a default: block.
> 
> Signed-off-by: Joe Perches <joe@...ches.com>

...

> diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c
> index 252fe06f58aa..1d5b87079104 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c
> @@ -345,7 +345,7 @@ static int matching_bar(struct nfp_bar *bar, u32 tgt, u32 act, u32 tok,
>  		baract = NFP_CPP_ACTION_RW;
>  		if (act == 0)
>  			act = NFP_CPP_ACTION_RW;
> -		fallthrough;
> +		break;
>  	case NFP_PCIE_BAR_PCIE2CPP_MapType_FIXED:
>  		break;
>  	default:

This is a cascading fall-through handling all map types.
I don't think this change improves readability.

...