Subject: Re: [PATCH bpf-next 2/3] bpf: Introduce BPF_BRANCH_SNAPSHOT_F_COPY flag for bpf_get_branch_snapshot helper

From: Leon Hwang <[email-masked]>
Date: Tue, 13 Jan 2026 09:43:02 +0800

Hi kernel test robot,

Thanks for the test results.

No further testing is needed for this patch series, as it will not be
pursued further and is not expected to be accepted upstream.

Thanks again for the testing effort.

Thanks,
Leon

On 13/1/26 03:22, kernel test robot wrote:
> 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/[email-masked]/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/[email-masked]/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 <[email-masked]>
> | Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/
> 
> 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)
>