netdev - Re: [PATCH bpf-next] scripts/bpf: Emit an #error directive known types list needs updating

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Date:   Wed, 16 Oct 2019 13:29:30 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        kernel-team@...udflare.com
Subject: Re: [PATCH bpf-next] scripts/bpf: Emit an #error directive known
 types list needs updating

On Wed, Oct 16, 2019 at 6:21 AM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> Make the compiler report a clear error when bpf_helpers_doc.py needs
> updating rather than rely on the fact that Clang fails to compile
> English:
>
> ../../../lib/bpf/bpf_helper_defs.h:2707:1: error: unknown type name 'Unrecognized'
> Unrecognized type 'struct bpf_inet_lookup', please add it to known types!
>
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---
>  scripts/bpf_helpers_doc.py | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/bpf_helpers_doc.py b/scripts/bpf_helpers_doc.py
> index 7df9ce598ff9..08300bc024da 100755
> --- a/scripts/bpf_helpers_doc.py
> +++ b/scripts/bpf_helpers_doc.py
> @@ -489,7 +489,7 @@ class PrinterHelpers(Printer):
>          if t in self.mapped_types:
>              return self.mapped_types[t]
>          print("")
> -        print("Unrecognized type '%s', please add it to known types!" % t)
> +        print("#error \"Unrecognized type '%s', please add it to known types!\"" % t)

My bad, this was intended to be printed to stderr, not to stdout
output. Can you please do a follow up patch turning this into eprint
instead?

This shouldn't be reported by Clang, rather by tool. And we should
ensure in libbpf's Makefile that bpf_helper_defs.h is deleted on
error. I'll do it a bit later, unless you'll beat me to it.

>          sys.exit(1)
>
>      seen_helpers = set()
> --
> 2.20.1
>