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[stable,5.19] kbuild: Add skip_encoding_btf_enum64 option to pahole

Message ID 20220916171234.841556-1-yakoyoku@gmail.com (mailing list archive)
State Not Applicable
Delegated to: BPF
Headers show
Series [stable,5.19] kbuild: Add skip_encoding_btf_enum64 option to pahole | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch

Commit Message

Martin Rodriguez Reboredo Sept. 16, 2022, 5:12 p.m. UTC 
New pahole (version 1.24) generates by default new BTF_KIND_ENUM64 BTF tag,
which is not supported by stable kernel.

As a result the kernel with CONFIG_DEBUG_INFO_BTF option will fail to
compile with following error:

  BTFIDS  vmlinux
FAILED: load BTF from vmlinux: Invalid argument

New pahole provides --skip_encoding_btf_enum64 option to skip BTF_KIND_ENUM64
generation and produce BTF supported by stable kernel.

Adding this option to scripts/pahole-flags.sh.

This change does not have equivalent commit in linus tree, because linus tree
has support for BTF_KIND_ENUM64 tag, so it does not need to be disabled.

Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 scripts/pahole-flags.sh | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/scripts/pahole-flags.sh b/scripts/pahole-flags.sh
index 0d99ef17e4a5..d4f3d63cb434 100755
--- a/scripts/pahole-flags.sh
+++ b/scripts/pahole-flags.sh
@@ -20,4 +20,8 @@  if [ "${pahole_ver}" -ge "122" ]; then
 	extra_paholeopt="${extra_paholeopt} -j"
 fi
 
+if [ "${pahole_ver}" -ge "124" ]; then
+	extra_paholeopt="${extra_paholeopt} --skip_encoding_btf_enum64"
+fi
+
 echo ${extra_paholeopt}