linux-kernel - Re: [PATCHv3 perf/core 1/6] tools lib bpf: Add BPF program pinning APIs.

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Message-ID: <20170131161320.GB4529@kernel.org>
Date:   Tue, 31 Jan 2017 13:13:20 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Joe Stringer <joe@....org>
Cc:     Wang Nan <wangnan0@...wei.com>, ast@...com,
        Daniel Borkmann <daniel@...earbox.net>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCHv3 perf/core 1/6] tools lib bpf: Add BPF program pinning
 APIs.

Em Tue, Jan 31, 2017 at 01:08:27PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Jan 30, 2017 at 09:58:05PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Jan 30, 2017 at 01:16:18PM -0800, Joe Stringer escreveu:
> > > On 30 January 2017 at 12:28, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> > > > ---
> > > > Thus, a return value of size or more means that the output was
> > > > truncated.
> > > > ---
> >  
> > > Good spotting, I looked over the committed versions and tested them,
> > > they seem good to me. Thanks!
> > 
> > Thanks for checking, will push Ingo's way after a battery of extra
> > tests, tomorrow,
> 
> Which failed for centos:5, centos:6, centos:7, debian:7, debian:8,
> debian:experimental and others, I stopped the test at this point,
> working on fixing it.
> 
> All seems related to:
> 
> libbpf.c:1267: error: 'BPF_FS_MAGIC' undeclared (first use in this function)
> libbpf.c:1267: error: (Each undeclared identifier is reported only once
> libbpf.c:1267: error: for each function it appears in.)

We need to carry a tools/include/uapi/linux/magic.c copy, check if it
drifts, remove the ifdefs for _FS_MAGIC defines from tools/ and use that
instead, etc, till then I'll just add the ifdef to libbpf.c.

[acme@...et linux]$ grep BPF_FS_MAGIC /usr/include/*/*.h
/usr/include/linux/magic.h:#define BPF_FS_MAGIC		0xcafe4a11
[acme@...et linux]$ rpm -qf /usr/include/linux/magic.h
kernel-headers-4.9.6-200.fc25.x86_64
[acme@...et linux]$ cat /etc/fedora-release 
Fedora release 25 (Twenty Five)
[acme@...et linux]$ 

But those other distros don't have it.

- Arnaldo