linux-kernel - Re: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch

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Message-ID: <202601122013.hmoeIXXs-lkp@intel.com>
Date: Mon, 12 Jan 2026 20:22:22 +0100
From: kernel test robot <lkp@...el.com>
To: Leon Hwang <leon.hwang@...ux.dev>, bpf@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	"David S . Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>,
	Matt Bobrowski <mattbobrowski@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Leon Hwang <leon.hwang@...ux.dev>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY
 flag for bpf_get_branch_snapshot helper

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@...el.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