linux-kernel - [PATCH 1/1] Documentation: Add minimum pahole version

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Date:   Tue, 16 Nov 2021 12:40:27 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jonathan Corbet <corbet@....net>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jiri Olsa <jolsa@...hat.com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] Documentation: Add minimum pahole version

A report was made in https://github.com/acmel/dwarves/issues/26 about
pahole not being listed in the process/changes.rst file as being needed
for building the kernel, address that.

Link: https://github.com/acmel/dwarves/issues/26
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: bpf@...r.kernel.org
Cc: netdev@...r.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 Documentation/process/changes.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index e35ab74a0f804b04..c45f167a1b6c02a4 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -35,6 +35,7 @@ GNU make               3.81             make --version
 binutils               2.23             ld -v
 flex                   2.5.35           flex --version
 bison                  2.0              bison --version
+pahole                 1.16             pahole --version
 util-linux             2.10o            fdformat --version
 kmod                   13               depmod -V
 e2fsprogs              1.41.4           e2fsck -V
@@ -108,6 +109,14 @@ Bison
 Since Linux 4.16, the build system generates parsers
 during build.  This requires bison 2.0 or later.
 
+pahole:
+-------
+
+Since Linux 5.2 the build system generates BTF (BPF Type Format) from DWARF in
+vmlinux, a bit later from kernel modules as well, if CONFIG_DEBUG_INFO_BTF is
+selected.  This requires pahole v1.16 or later. It is found in the 'dwarves' or
+'pahole' distro packages or from https://fedorapeople.org/~acme/dwarves/.
+
 Perl
 ----
 
-- 
2.31.1