From: kernel test robot <lkp@intel.com>
To: Leon Hwang <leon.hwang@linux.dev>, bpf@vger.kernel.org
Cc: 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>,
Puranjay Mohan <puranjay@kernel.org>,
Xu Kuohai <xukuohai@huaweicloud.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Thomas Gleixner <tglx@kernel.org>,
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>,
Shuah Khan <skhan@linuxfoundation.org>,
Leon Hwang <leon.hwang@linux.dev>,
Peilin Ye <yepeilin@google.com>,
Luis Gerhorst <luis.gerhorst@fau.de>,
Viktor Malik <vmalik@redhat.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH bpf-next v2 2/6] bpf, x86: Add 64-bit bitops kfuncs support for x86_64
Date: Fri, 20 Feb 2026 06:05:16 +0800 [thread overview]
Message-ID: <202602200536.JWzGHAc6-lkp@intel.com> (raw)
In-Reply-To: <20260219142933.13904-3-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-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-073-20260220 (https://download.01.org/0day-ci/archive/20260220/202602200536.JWzGHAc6-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260220/202602200536.JWzGHAc6-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/202602200536.JWzGHAc6-lkp@intel.com/
All errors (new ones prefixed by >>):
ld: arch/x86/net/bpf_jit_comp.o: in function `bpf_inlines_func_call':
>> arch/x86/net/bpf_jit_comp.c:1621:(.text+0xe70b): undefined reference to `bpf_clz64'
>> ld: arch/x86/net/bpf_jit_comp.c:1647:(.text+0xe718): undefined reference to `bpf_ctz64'
>> ld: arch/x86/net/bpf_jit_comp.c:1673:(.text+0xe725): undefined reference to `bpf_ffs64'
>> ld: arch/x86/net/bpf_jit_comp.c:1677:(.text+0xe732): undefined reference to `bpf_fls64'
>> ld: arch/x86/net/bpf_jit_comp.c:1683:(.text+0xe743): undefined reference to `bpf_popcnt64'
>> ld: arch/x86/net/bpf_jit_comp.c:1707:(.text+0xe758): undefined reference to `bpf_rol64'
>> ld: arch/x86/net/bpf_jit_comp.c:1714:(.text+0xe765): undefined reference to `bpf_ror64'
ld: arch/x86/net/bpf_jit_comp.c:1647:(.text+0x10e85): undefined reference to `bpf_ctz64'
ld: arch/x86/net/bpf_jit_comp.c:1673:(.text+0x10e92): undefined reference to `bpf_ffs64'
ld: arch/x86/net/bpf_jit_comp.o: in function `bpf_jit_inlines_kfunc_call':
>> arch/x86/net/bpf_jit_comp.c:4247:(.text+0x177c8): undefined reference to `bpf_ffs64'
ld: arch/x86/net/bpf_jit_comp.c:4247:(.text+0x177d1): undefined reference to `bpf_ctz64'
ld: arch/x86/net/bpf_jit_comp.c:4250:(.text+0x177da): undefined reference to `bpf_fls64'
>> ld: arch/x86/net/bpf_jit_comp.c:4250:(.text+0x177e3): undefined reference to `bpf_clz64'
ld: arch/x86/net/bpf_jit_comp.c:4253:(.text+0x177ec): undefined reference to `bpf_popcnt64'
ld: arch/x86/net/bpf_jit_comp.c:4256:(.text+0x177f5): undefined reference to `bpf_ror64'
ld: arch/x86/net/bpf_jit_comp.c:4256:(.text+0x177ff): undefined reference to `bpf_rol64'
vim +1621 arch/x86/net/bpf_jit_comp.c
1607
1608 static bool bpf_inlines_func_call(u8 **pprog, void *func)
1609 {
1610 bool has_popcnt = boot_cpu_has(X86_FEATURE_POPCNT);
1611 bool has_bmi1 = boot_cpu_has(X86_FEATURE_BMI1);
1612 bool has_abm = boot_cpu_has(X86_FEATURE_ABM);
1613 bool inlined = true;
1614 u8 *prog = *pprog;
1615
1616 /*
1617 * x86 Bit manipulation instruction set
1618 * https://en.wikipedia.org/wiki/X86_Bit_manipulation_instruction_set
1619 */
1620
> 1621 if (func == bpf_clz64 && has_abm) {
1622 /*
1623 * Intel® 64 and IA-32 Architectures Software Developer's Manual (June 2023)
1624 *
1625 * LZCNT - Count the Number of Leading Zero Bits
1626 *
1627 * Opcode/Instruction
1628 * F3 REX.W 0F BD /r
1629 * LZCNT r64, r/m64
1630 *
1631 * Op/En
1632 * RVM
1633 *
1634 * 64/32-bit Mode
1635 * V/N.E.
1636 *
1637 * CPUID Feature Flag
1638 * LZCNT
1639 *
1640 * Description
1641 * Count the number of leading zero bits in r/m64, return
1642 * result in r64.
1643 */
1644 /* emit: x ? 64 - fls64(x) : 64 */
1645 /* lzcnt rax, rdi */
1646 EMIT5(0xF3, 0x48, 0x0F, 0xBD, 0xC7);
> 1647 } else if (func == bpf_ctz64 && has_bmi1) {
1648 /*
1649 * Intel® 64 and IA-32 Architectures Software Developer's Manual (June 2023)
1650 *
1651 * TZCNT - Count the Number of Trailing Zero Bits
1652 *
1653 * Opcode/Instruction
1654 * F3 REX.W 0F BC /r
1655 * TZCNT r64, r/m64
1656 *
1657 * Op/En
1658 * RVM
1659 *
1660 * 64/32-bit Mode
1661 * V/N.E.
1662 *
1663 * CPUID Feature Flag
1664 * BMI1
1665 *
1666 * Description
1667 * Count the number of trailing zero bits in r/m64, return
1668 * result in r64.
1669 */
1670 /* emit: x ? __ffs64(x) : 64 */
1671 /* tzcnt rax, rdi */
1672 EMIT5(0xF3, 0x48, 0x0F, 0xBC, 0xC7);
> 1673 } else if (func == bpf_ffs64 && has_bmi1) {
1674 /* emit: __ffs64(x); x == 0 has been handled in verifier */
1675 /* tzcnt rax, rdi */
1676 EMIT5(0xF3, 0x48, 0x0F, 0xBC, 0xC7);
> 1677 } else if (func == bpf_fls64 && has_abm) {
1678 /* emit: fls64(x) */
1679 /* lzcnt rax, rdi */
1680 EMIT5(0xF3, 0x48, 0x0F, 0xBD, 0xC7);
1681 EMIT3(0x48, 0xF7, 0xD8); /* neg rax */
1682 EMIT4(0x48, 0x83, 0xC0, 0x40); /* add rax, 64 */
> 1683 } else if (func == bpf_popcnt64 && has_popcnt) {
1684 /*
1685 * Intel® 64 and IA-32 Architectures Software Developer's Manual (June 2023)
1686 *
1687 * POPCNT - Return the Count of Number of Bits Set to 1
1688 *
1689 * Opcode/Instruction
1690 * F3 REX.W 0F B8 /r
1691 * POPCNT r64, r/m64
1692 *
1693 * Op/En
1694 * RM
1695 *
1696 * 64 Mode
1697 * Valid
1698 *
1699 * Compat/Leg Mode
1700 * N.E.
1701 *
1702 * Description
1703 * POPCNT on r/m64
1704 */
1705 /* popcnt rax, rdi */
1706 EMIT5(0xF3, 0x48, 0x0F, 0xB8, 0xC7);
> 1707 } else if (func == bpf_rol64) {
1708 EMIT1(0x51); /* push rcx */
1709 /* emit: rol64(x, s) */
1710 EMIT3(0x48, 0x89, 0xF1); /* mov rcx, rsi */
1711 EMIT3(0x48, 0x89, 0xF8); /* mov rax, rdi */
1712 EMIT3(0x48, 0xD3, 0xC0); /* rol rax, cl */
1713 EMIT1(0x59); /* pop rcx */
> 1714 } else if (func == bpf_ror64) {
1715 EMIT1(0x51); /* push rcx */
1716 /* emit: ror64(x, s) */
1717 EMIT3(0x48, 0x89, 0xF1); /* mov rcx, rsi */
1718 EMIT3(0x48, 0x89, 0xF8); /* mov rax, rdi */
1719 EMIT3(0x48, 0xD3, 0xC8); /* ror rax, cl */
1720 EMIT1(0x59); /* pop rcx */
1721 } else {
1722 inlined = false;
1723 }
1724
1725 *pprog = prog;
1726 return inlined;
1727 }
1728
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next prev parent reply other threads:[~2026-02-19 22:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-19 14:29 [PATCH bpf-next v2 0/6] bpf: Introduce 64-bit bitops kfuncs Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 1/6] " Leon Hwang
2026-02-19 17:50 ` Alexei Starovoitov
2026-02-20 15:34 ` Leon Hwang
2026-02-21 9:58 ` Dan Carpenter
2026-02-21 12:50 ` Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 2/6] bpf, x86: Add 64-bit bitops kfuncs support for x86_64 Leon Hwang
2026-02-19 17:47 ` Alexei Starovoitov
2026-02-20 15:54 ` Leon Hwang
2026-02-20 17:50 ` Alexei Starovoitov
2026-02-21 12:45 ` Leon Hwang
2026-02-21 16:51 ` Alexei Starovoitov
2026-02-23 16:35 ` Leon Hwang
2026-02-19 22:05 ` kernel test robot [this message]
2026-02-20 14:12 ` Leon Hwang
2026-02-20 11:59 ` kernel test robot
2026-02-19 14:29 ` [PATCH bpf-next v2 3/6] bpf, arm64: Add 64-bit bitops kfuncs support Leon Hwang
2026-02-19 15:10 ` Puranjay Mohan
2026-02-19 15:20 ` Puranjay Mohan
2026-02-19 15:25 ` Puranjay Mohan
2026-02-19 15:36 ` Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 4/6] selftests/bpf: Add tests for 64-bit bitops kfuncs Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 5/6] selftests/bpf: Add __cpu_feature annotation for CPU-feature-gated tests Leon Hwang
2026-02-19 14:29 ` [PATCH bpf-next v2 6/6] selftests/bpf: Add JIT disassembly tests for 64-bit bitops kfuncs Leon Hwang
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