linux-kernel - Re: linux-next: build failure after merge of the bpf-next tree

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Message-ID: <20210312120014.62ced6dd@canb.auug.org.au>
Date:   Fri, 12 Mar 2021 12:00:14 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Björn Töpel <bjorn.topel@...el.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: linux-next: build failure after merge of the bpf-next tree

Hi Björn,

[Cc'ing a few (maybe) interested parties]

On Thu, 11 Mar 2021 07:47:03 +0100 Björn Töpel <bjorn.topel@...el.com> wrote:
>
> On 2021-03-11 01:47, Stephen Rothwell wrote:
> > 
> > After merging the bpf-next tree, today's linux-next build (perf) failed
> > like this:
> > 
> > make[3]: *** No rule to make target 'libbpf_util.h', needed by '/home/sfr/next/perf/staticobjs/xsk.o'.  Stop.
> 
> It's an incremental build issue, as pointed out here [1], that is
> resolved by cleaning the build.

Does this mean there is a deficiency in the dependencies in our build system?

> [1] https://lore.kernel.org/bpf/CAEf4BzYPDF87At4=_gsndxof84OiqyJxgAHL7_jvpuntovUQ8w@mail.gmail.com/
> 
> > Caused by commit
> > 
> >    7e8bbe24cb8b ("libbpf: xsk: Move barriers from libbpf_util.h to xsk.h")
> > 
> > I have used the bpf tree from next-20210310 for today.

I have set my system to remove the object directory before building
after merging the bpf-next tree for now.

-- 
Cheers,
Stephen Rothwell

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