linux-kernel - Re: [PATCH] nfs: remove incorrect fallthrough label

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Date:   Tue, 15 Sep 2020 16:29:41 -0700
From:   Joe Perches <joe@...ches.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>
Cc:     "Gustavo A . R . Silva" <gustavo@...eddedor.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Hongxiang Lou <louhongxiang@...wei.com>,
        linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] nfs: remove incorrect fallthrough label

On Tue, 2020-09-15 at 15:57 -0700, Nick Desaulniers wrote:
> There is no case after the default from which to fallthrough to. Clang
> will error in this case (unhelpfully without context, see link below)
> and GCC will with -Wswitch-unreachable.
> 
> The previous commit should have just removed the comment.
[]
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
[]
> @@ -889,7 +889,6 @@ static struct nfs_server *nfs_try_mount_request(struct fs_context *fc)
>  		default:
>  			if (rpcauth_get_gssinfo(flavor, &info) != 0)
>  				continue;
> -			fallthrough;

My preference would be to convert the fallthrough
to a break here so if someone ever adds another
label after default: for any reason, the code would
still work as expected.

>  		}
>