netdev - Re: [PATCH v2 bpf-next 5/8] bpf: introduce BPF_RAW

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Message-ID: <CA+55aFxAay8y8eFbykzTFQG8MzXJ63LyE14XEuYkemq=99zqRA@mail.gmail.com>
Date:   Fri, 23 Mar 2018 19:01:35 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Alexei Starovoitov <ast@...com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Network Development <netdev@...r.kernel.org>,
        kernel-team <kernel-team@...com>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 bpf-next 5/8] bpf: introduce BPF_RAW_TRACEPOINT

On Fri, Mar 23, 2018 at 6:43 PM, Alexei Starovoitov <ast@...com> wrote:
>
> it's not the limit I'm hitting, but self referential issue.
> Exactly half gets expanded.
> I don't think there is an easy workaround other
> than duplicating the whole chain of REPEAT macro twice
> with slightly different name.

Take a look at the __MAP() macro in include/linux/syscalls.h.

It basically takes a "transformation" as its argument, and does it <n>
times, where 'n' is the first argument (but could be self-counting).

Maybe it will give you some ideas.

... and maybe it will just drive you mad and make you gouge out your
eyes with a spoon. Don't blame the messenger.

             Linus