From: Kamal Mostafa <kamal@canonical.com>
To: andrii.nakryiko@gmail.com
Cc: Kamal Mostafa <kamal@canonical.com>,
stable@vger.kernel.org, Shuah Khan <shuah@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
linux-kselftest@vger.kernel.org, netdev@vger.kernel.org,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] selftests/bpf: clarify build error if no vmlinux
Date: Tue, 15 Dec 2020 10:20:10 -0800 [thread overview]
Message-ID: <20201215182011.15755-1-kamal@canonical.com> (raw)
In-Reply-To: <CAEf4BzYBvz4TDayTE=Bc_bjqvOGaavmmw1sJhOCKhq9DwUpd4A@mail.gmail.com>
If Makefile cannot find any of the vmlinux's in its VMLINUX_BTF_PATHS list,
it tries to run btftool incorrectly, with VMLINUX_BTF unset:
bpftool btf dump file $(VMLINUX_BTF) format c
Such that the keyword 'format' is misinterpreted as the path to vmlinux.
The resulting build error message is fairly cryptic:
GEN vmlinux.h
Error: failed to load BTF from format: No such file or directory
This patch makes the failure reason clearer by yielding this instead:
Makefile:...: *** cannot find a vmlinux for VMLINUX_BTF at any of
"{paths}". Stop.
Fixes: acbd06206bbb ("selftests/bpf: Add vmlinux.h selftest exercising tracing of syscalls")
Cc: stable@vger.kernel.org # 5.7+
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
[v2] moves the check to right after the VMLINUX_BTF definition.
tools/testing/selftests/bpf/Makefile | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 542768f5195b..7ba631f495f7 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -146,6 +146,9 @@ VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
/sys/kernel/btf/vmlinux \
/boot/vmlinux-$(shell uname -r)
VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
+ifeq ($(VMLINUX_BTF),)
+$(error cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
+endif
DEFAULT_BPFTOOL := $(SCRATCH_DIR)/sbin/bpftool
--
2.17.1
next prev parent reply other threads:[~2020-12-15 18:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 20:20 [PATCH] selftests/bpf: clarify build error if no vmlinux Kamal Mostafa
2020-12-15 1:37 ` Andrii Nakryiko
2020-12-15 18:20 ` Kamal Mostafa [this message]
2020-12-16 18:06 ` [PATCH v2] " Andrii Nakryiko
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