netdev - Re: [PATCH bpf-next 1/2] btf: resolve enum fwds in btf

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Message-ID: <20190314210111.lveoorx7wfhq3cxa@ast-mbp>
Date:   Thu, 14 Mar 2019 14:01:13 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Edward Cree <ecree@...arflare.com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Kernel Team <Kernel-team@...com>,
        Alexei Starovoitov <ast@...com>,
        "acme@...nel.org" <acme@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>
Subject: Re: [PATCH bpf-next 1/2] btf: resolve enum fwds in btf_dedup

On Mon, Mar 11, 2019 at 10:39:37AM -0700, Andrii Nakryiko wrote:
> 
> There is a GCC extension that allows to forward-declare enums:
> https://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete-Enums
> 
> Kernel actually has examples of using this (see patch description
> regrading irqchip_irq_state).

we've considered several different ways of either extending or changing BTF api
to accommodate this unforeseen C langauge extension.
All of them require patches for the kernel 5.1 and 5.0 and/or llvm,
so we've decided to proceed with the existing kernel code and llvm
and only tweak btf dedup logic the way this patch does.

I've applied this set to bpf tree.