From: kernel test robot <lkp@intel.com>
To: Leon Hwang <leon.hwang@linux.dev>, bpf@vger.kernel.org
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
"David S . Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
Matt Bobrowski <mattbobrowski@google.com>,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Shuah Khan <skhan@linuxfoundation.org>,
Leon Hwang <leon.hwang@linux.dev>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-trace-kernel@vger.kernel.org
Subject: Re: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch_snapshot helper
Date: Mon, 12 Jan 2026 20:22:22 +0100 [thread overview]
Message-ID: <202601122013.hmoeIXXs-lkp@intel.com> (raw)
In-Reply-To: <20260109153420.32181-3-leon.hwang@linux.dev>
Hi Leon,
kernel test robot noticed the following build errors:
[auto build test ERROR on bpf-next/master]
url: https://github.com/intel-lab-lkp/linux/commits/Leon-Hwang/bpf-x64-Call-perf_snapshot_branch_stack-in-trampoline/20260109-234435
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20260109153420.32181-3-leon.hwang%40linux.dev
patch subject: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch_snapshot helper
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260112/202601122013.hmoeIXXs-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260112/202601122013.hmoeIXXs-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601122013.hmoeIXXs-lkp@intel.com/
All errors (new ones prefixed by >>):
>> ld.lld: error: undefined symbol: bpf_branch_snapshot
>>> referenced by bpf_trace.c:1182 (kernel/trace/bpf_trace.c:1182)
>>> vmlinux.o:(bpf_get_branch_snapshot)
>>> referenced by bpf_trace.c:0 (kernel/trace/bpf_trace.c:0)
>>> vmlinux.o:(bpf_get_branch_snapshot)
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next prev parent reply other threads:[~2026-01-12 19:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-09 15:34 [PATCH bpf-next 0/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch_snapshot helper Leon Hwang
2026-01-09 15:34 ` [PATCH bpf-next 1/3] bpf, x64: Call perf_snapshot_branch_stack in trampoline Leon Hwang
2026-01-09 16:24 ` Alexei Starovoitov
2026-01-09 16:31 ` Leon Hwang
2026-01-09 15:34 ` [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch_snapshot helper Leon Hwang
2026-01-12 19:22 ` kernel test robot [this message]
2026-01-13 1:43 ` Leon Hwang
2026-01-09 15:34 ` [PATCH bpf-next 3/3] selftests/bpf: Add BPF_BRANCH_SNAPSHOT_F_COPY test Leon Hwang
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