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Date:   Thu, 19 Jan 2023 14:41:12 -0300
From:   Arnaldo Carvalho de Melo <acme@kernel.org>
To:     Ian Rogers <irogers@google.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Andres Freund <andres@anarazel.de>,
        Quentin Monnet <quentin@isovalent.com>,
        Roberto Sassu <roberto.sassu@huawei.com>,
        Christy Lee <christylee@fb.com>,
        Andrii Nakryiko <andrii@kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        bpf@vger.kernel.org, Michael Petlan <mpetlan@redhat.com>,
        Ben Hutchings <ben@decadent.org.uk>
Subject: Re: [PATCH v2 0/3] Assume libbpf 1.0+
Message-ID: <Y8mAuDvs566zwG67@kernel.org>
References: <20230116010115.490713-1-irogers@google.com>
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Em Thu, Jan 19, 2023 at 09:11:03AM -0800, Ian Rogers escreveu:
> On Sun, Jan 15, 2023 at 5:01 PM Ian Rogers <irogers@google.com> wrote:
> > libbpf 1.0 was a major change in API. Perf has partially supported
> > older libbpf's but an implementation may be:
> > ..
> >        pr_err("%s: not support, update libbpf\n", __func__);
> >        return -ENOTSUP;
> > ..
> >
> > Rather than build a binary that would fail at runtime it is
> > preferrential just to build libbpf statically and link against
> > that. The static version is in the kernel tools tree and newer than
> > 1.0.
> >
> > These patches change the libbpf test to only pass when at least
> > version 1.0 is installed, then remove the conditional build and
> > feature logic.
> >
> > The issue is discussed here:
> > https://lore.kernel.org/lkml/20230106151320.619514-1-irogers@google.com/
> > perf bpf:
> >
> > A variant of this fix was added to Linux 6.2 in:
> > "perf bpf: Avoid build breakage with libbpf < 0.8.0 + LIBBPF_DYNAMIC=1"
> > https://lore.kernel.org/lkml/Y71+eh00Ju7WeEFX@kernel.org/
> > This change goes further in removing logic that is now no longer
> > necessary.
> >
> > v2. Rebase now that breakage fix patch is in linus/master.
> 
> I missed the:
> Acked/Tested-by: Jiri Olsa <jolsa@kernel.org>
> I believe we are waiting for package maintainer input.

Yes, as fedora:37 still is at libbpf 0.8.0 :-\

This is what I have in the containers I test, sure, the older ones
already have NO_LIBBPF=1 and some will get this added, and some I still
need to ask for libbpf-devel (or the distro specific name, like
libbpf-dev):

[perfbuilder@five ~]$ podman images --format "{{.Repository}}:{{.Tag}}" | grep /acmel/ | grep -v '<none>' | sort -t: -Vk1,2 | grep -v -- -x- | while read image ; do echo -n $image: ; libbpf=$(podman run --rm -t --entrypoint=ls $image -la /usr/lib64/libbpf.so.1) ; echo $libbpf ; done
localhost/acmel/linux-perf-tools-build-almalinux:8:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-almalinux:9:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-alpine:3.12:ls: /usr/lib64/libbpf.so.1: No such file or directory
localhost/acmel/linux-perf-tools-build-alpine:3.13:ls: /usr/lib64/libbpf.so.1: No such file or directory
localhost/acmel/linux-perf-tools-build-alpine:3.14:ls: /usr/lib64/libbpf.so.1: No such file or directory
localhost/acmel/linux-perf-tools-build-alpine:3.15:ls: /usr/lib64/libbpf.so.1: No such file or directory
localhost/acmel/linux-perf-tools-build-alpine:3.16:ls: /usr/lib64/libbpf.so.1: No such file or directory
localhost/acmel/linux-perf-tools-build-alpine:3.17:ls: /usr/lib64/libbpf.so.1: No such file or directory
localhost/acmel/linux-perf-tools-build-alpine:edge:ls: /usr/lib64/libbpf.so.1: No such file or directory
localhost/acmel/linux-perf-tools-build-alt:p9:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-alt:p10:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-alt:sisyphus:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-amazonlinux:2:ls: cannot access /usr/lib64/libbpf.so.1: No such file or directory
localhost/acmel/linux-perf-tools-build-amazonlinux:devel:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-archlinux:base:lrwxrwxrwx 1 root root 15 Oct 1 12:32 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.1
localhost/acmel/linux-perf-tools-build-centos:8:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-centos:stream:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-clearlinux:latest:lrwxrwxrwx 1 root root 15 Sep 30 16:01 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.1
localhost/acmel/linux-perf-tools-build-debian:10:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-debian:11:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-debian:experimental:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:26:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:27:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:28:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:29:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:30:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:31:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:32:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:33:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:34:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:35:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:36:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:37:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-fedora:38:lrwxrwxrwx. 1 root root 15 Dec 20 14:39 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.0
localhost/acmel/linux-perf-tools-build-fedora:rawhide:lrwxrwxrwx. 1 root root 15 Dec 20 14:39 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.0
localhost/acmel/linux-perf-tools-build-gentoo-stage3:latest:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-manjaro:base:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-opensuse:15.0:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-opensuse:15.1:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-opensuse:15.2:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-opensuse:15.3:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-opensuse:15.4:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-opensuse:15.5:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-opensuse:tumbleweed:lrwxrwxrwx. 1 root root 15 Nov 9 12:08 /usr/lib64/libbpf.so.1 -> libbpf.so.1.0.1
localhost/acmel/linux-perf-tools-build-oraclelinux:8:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-oraclelinux:9:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-rockylinux:8:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-rockylinux:9:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-ubuntu:18.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-ubuntu:20.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-ubuntu:21.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-ubuntu:21.10:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-ubuntu:22.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-ubuntu:22.10:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
localhost/acmel/linux-perf-tools-build-ubuntu:23.04:ls: cannot access '/usr/lib64/libbpf.so.1': No such file or directory
[perfbuilder@five ~]$

[perfbuilder@five linux-perf-tools-build]$ grep libbpf-dev */*/Dockerfile
debian/experimental/Dockerfile:	libbpf-dev \
fedora/35/Dockerfile:		   libtraceevent-devel libbpf-devel \
fedora/36/Dockerfile:		   libtraceevent-devel libbpf-devel \
fedora/37/Dockerfile:		   libtraceevent-devel libbpf-devel \
fedora/38/Dockerfile:		   libtraceevent-devel libbpf-devel \
fedora/rawhide/Dockerfile:	libtraceevent-devel libbpf-devel \
opensuse/tumbleweed/Dockerfile:	libbpf-devel libtraceevent-devel \
ubuntu/22.04/Dockerfile:	libelf-dev libiberty-dev libdw-dev libaudit-dev libtraceevent-dev libbpf-dev \
ubuntu/22.10/Dockerfile:	libelf-dev libiberty-dev libdw-dev libaudit-dev libtraceevent-dev libbpf-dev \
ubuntu/23.04/Dockerfile:	libelf-dev libiberty-dev libdw-dev libaudit-dev libtraceevent-dev libbpf-dev \
[perfbuilder@five linux-perf-tools-build]$

In some cases it gets dragged on differently, like with clearlinux,
gentoo, archlinux, etc.

Anyway, just a data point, I'll check if I'm missing installing it
somewhere.

- Arnaldo