Re: [PATCH perf/core REBASE 3/5] tools lib bpf: Add bpf_prog_{attach,detach}

[Arnaldo Carvalho de Melo]

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@xxxxxxxxxx> 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