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SubjectRe: [PATCH v3] nfs: remove incorrect fallthrough label
Hello maintainers,
Would you mind please picking up this patch? KernelCI has been
erroring for over a week without it.

On Thu, Sep 17, 2020 at 2:45 PM Nick Desaulniers
<ndesaulniers@google.com> 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
> * fallthrough
> * goto
> * (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
> Acked-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
> Suggested-by: Joe Perches <joe@perches.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> Changes v3:
> * update the commit message as per Joe.
> * collect tags.
>
> 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;
> --
> 2.28.0.681.g6f77f65b4e-goog
>


--
Thanks,
~Nick Desaulniers

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