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scripts: Require pahole v1.16 when generating BTF 

bpf_iter requires the kernel BTF to be generated with
pahole >= 1.16, since otherwise the function definitions
that the iterator attaches to are not included.
This failure mode is indistiguishable from trying to attach
to an iterator that really doesn't exist.

Since it's really easy to miss this requirement, bump the
pahole version check used at build time to at least 1.16.

Fixes: 15d83c4d7c ("bpf: Allow loading of a bpf_iter program")
Suggested-by: Ivan Babrou <ivan@cloudflare.com>
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200608094257.47366-1-lmb@cloudflare.com
This commit is contained in:
Lorenz Bauer 2020-06-08 10:42:57 +01:00 committed by Alexei Starovoitov
parent 75e68e5bf2
commit 21a85bd601
1 changed files with 2 additions and 2 deletions
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4
scripts/link-vmlinux.sh
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@ -143,8 +143,8 @@ gen_btf()
fi
pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/')
if [ "${pahole_ver}" -lt "113" ]; then
echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.13"
if [ "${pahole_ver}" -lt "116" ]; then
echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16"
return 1
fi