netdev - [PATCH bpf-next 1/2] bpf: Use --no-fail option if CONFIG

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Message-Id: <20200918122654.2625699-1-jolsa@kernel.org>
Date:   Fri, 18 Sep 2020 14:26:53 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Seth Forshee <seth.forshee@...onical.com>
Subject: [PATCH bpf-next 1/2] bpf: Use --no-fail option if CONFIG_BPF is not enabled

Currently all the resolve_btfids 'users' are under CONFIG_BPF
code, so if we have CONFIG_BPF disabled, resolve_btfids will
fail, because there's no data to resolve.

In case CONFIG_BPF is disabled, using resolve_btfids --no-fail
option, that makes resolve_btfids leave quietly if there's no
data to resolve.

Fixes: c9a0f3b85e09 ("bpf: Resolve BTF IDs in vmlinux image")
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 scripts/link-vmlinux.sh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index e6e2d9e5ff48..3173b8cf08cb 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -342,8 +342,13 @@ vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o}
 
 # fill in BTF IDs
 if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
-info BTFIDS vmlinux
-${RESOLVE_BTFIDS} vmlinux
+	info BTFIDS vmlinux
+	# Let's be more permissive if CONFIG_BPF is disabled
+	# and do not fail if there's no data to resolve.
+	if [ -z "${CONFIG_BPF}" ]; then
+	  no_fail=--no-fail
+	fi
+	${RESOLVE_BTFIDS} $no_fail vmlinux
 fi
 
 if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then
-- 
2.26.2