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SubjectRe: [PATCH v2] nfs: remove incorrect fallthrough label
On Wed, Sep 16, 2020 at 01:02:55PM -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 replaced the comment with a break
> statement.
>
> If we consider implicit fallthrough to be a design mistake of C, then
> all case statements should be terminated with one of the following
> statements:
> * break
> * continue
> * return
> * __attribute__(__fallthrough__)
> * goto (plz no)
> * (call of function with __attribute__(__noreturn__))
>
> Fixes: 2a1390c95a69 ("nfs: Convert to use the preferred fallthrough macro")
> Link: https://bugs.llvm.org/show_bug.cgi?id=47539
> Suggested-by: Joe Perches <joe@perches.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>

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

> ---
> Changes v2:
> * add break rather than no terminating statement as per Joe.
> * add Joe's suggested by tag.
> * add blurb about acceptable terminal statements.
>
> fs/nfs/super.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index d20326ee0475..eb2401079b04 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -889,7 +889,7 @@ static struct nfs_server *nfs_try_mount_request(struct fs_context *fc)
> default:
> if (rpcauth_get_gssinfo(flavor, &info) != 0)
> continue;
> - fallthrough;
> + break;
> }
> dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
> ctx->selected_flavor = flavor;
> --
> 2.28.0.618.gf4bc123cb7-goog
>

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