Subject: Re: [PATCH bpf-next v2 2/6] bpf, x86: Add 64-bit bitops kfuncs support for x86_64

From: kernel test robot <[email-masked]>
Date: Fri, 20 Feb 2026 19:59:16 +0800

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-Introduce-64-bit-bitops-kfuncs/20260219-223550
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20260219142933.13904-3-leon.hwang%40linux.dev
patch subject: [PATCH bpf-next v2 2/6] bpf, x86: Add 64-bit bitops kfuncs support for x86_64
config: x86_64-randconfig-012-20260220 (https://download.01.org/0day-ci/archive/20260220/[email-masked]/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260220/[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_clz64
   >>> referenced by bpf_jit_comp.c:1621 (arch/x86/net/bpf_jit_comp.c:1621)
   >>>               arch/x86/net/bpf_jit_comp.o:(do_jit) in archive vmlinux.a
   >>> referenced by bpf_jit_comp.c:4250 (arch/x86/net/bpf_jit_comp.c:4250)
   >>>               arch/x86/net/bpf_jit_comp.o:(bpf_jit_inlines_kfunc_call) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: bpf_ctz64
   >>> referenced by bpf_jit_comp.c:1647 (arch/x86/net/bpf_jit_comp.c:1647)
   >>>               arch/x86/net/bpf_jit_comp.o:(do_jit) in archive vmlinux.a
   >>> referenced by bpf_jit_comp.c:4247 (arch/x86/net/bpf_jit_comp.c:4247)
   >>>               arch/x86/net/bpf_jit_comp.o:(bpf_jit_inlines_kfunc_call) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: bpf_ffs64
   >>> referenced by bpf_jit_comp.c:1673 (arch/x86/net/bpf_jit_comp.c:1673)
   >>>               arch/x86/net/bpf_jit_comp.o:(do_jit) in archive vmlinux.a
   >>> referenced by bpf_jit_comp.c:4247 (arch/x86/net/bpf_jit_comp.c:4247)
   >>>               arch/x86/net/bpf_jit_comp.o:(bpf_jit_inlines_kfunc_call) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: bpf_fls64
   >>> referenced by bpf_jit_comp.c:1677 (arch/x86/net/bpf_jit_comp.c:1677)
   >>>               arch/x86/net/bpf_jit_comp.o:(do_jit) in archive vmlinux.a
   >>> referenced by bpf_jit_comp.c:4250 (arch/x86/net/bpf_jit_comp.c:4250)
   >>>               arch/x86/net/bpf_jit_comp.o:(bpf_jit_inlines_kfunc_call) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: bpf_popcnt64
   >>> referenced by bpf_jit_comp.c:1683 (arch/x86/net/bpf_jit_comp.c:1683)
   >>>               arch/x86/net/bpf_jit_comp.o:(do_jit) in archive vmlinux.a
   >>> referenced by bpf_jit_comp.c:4253 (arch/x86/net/bpf_jit_comp.c:4253)
   >>>               arch/x86/net/bpf_jit_comp.o:(bpf_jit_inlines_kfunc_call) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: bpf_rol64
   >>> referenced by bpf_jit_comp.c:1707 (arch/x86/net/bpf_jit_comp.c:1707)
   >>>               arch/x86/net/bpf_jit_comp.o:(do_jit) in archive vmlinux.a
   >>> referenced by bpf_jit_comp.c:4256 (arch/x86/net/bpf_jit_comp.c:4256)
   >>>               arch/x86/net/bpf_jit_comp.o:(bpf_jit_inlines_kfunc_call) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: bpf_ror64
   >>> referenced by bpf_jit_comp.c:1714 (arch/x86/net/bpf_jit_comp.c:1714)
   >>>               arch/x86/net/bpf_jit_comp.o:(do_jit) in archive vmlinux.a
   >>> referenced by bpf_jit_comp.c:4256 (arch/x86/net/bpf_jit_comp.c:4256)
   >>>               arch/x86/net/bpf_jit_comp.o:(bpf_jit_inlines_kfunc_call) in archive vmlinux.a

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki