linux-kernel - Re: [PATCH perf/core REBASE 3/5] tools lib bpf: Add bpf_prog

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Date:   Wed, 21 Dec 2016 13:06:47 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Joe Stringer <joe@....org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, Wang Nan <wangnan0@...wei.com>,
        ast@...com, Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH perf/core REBASE 3/5] tools lib bpf: Add
 bpf_prog_{attach,detach}

Em Tue, Dec 20, 2016 at 10:50:22AM -0800, Joe Stringer escreveu:
> On 20 December 2016 at 06:32, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> > Em Tue, Dec 20, 2016 at 11:18:51AM -0300, Arnaldo Carvalho de Melo escreveu:
> >> This one makes it fail for CentOS 5 and 6, others may fail as well,
> >> still building, investigating...
> >
> > Ok, fixed it by making it follow the model of the other sys_bpf wrappers
> > setting up that bpf_attr union wrt initializing unamed struct members:
> > -       union bpf_attr attr = {
> > -               .target_fd = target_fd,
> > -       };
> > +       union bpf_attr attr;
> > +
> > +       bzero(&attr, sizeof(attr));
> > +       attr.target_fd     = target_fd;

> Ah, I just shifted these across originally so the delta would be
> minimal but now I know why this code is like this. Thanks.

np, making sure this code works in all those environments requires
automation, I'd say its impossible otherwise, too many details :-\

Fixed, pushed, merged, should hit 4.10 soon :-)

- Arnaldo