From: Lorenz Bauer <lmb@cloudflare.com>
Date: Mon, 8 Jun 2020 09:42:57 +0000 (+0100)
Subject: scripts: Require pahole v1.16 when generating BTF
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=21a85bd601ee50f2796d52c542c46d04e21cedac;p=linux.git

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: 15d83c4d7cef ("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
---

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 3adef49250af9..a37875904ca68 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -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