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Peter Anvin" , Shuah Khan , Leon Hwang , Peilin Ye , Luis Gerhorst , Viktor Malik , 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 Message-ID: <202602200536.JWzGHAc6-lkp@intel.com> References: <20260219142933.13904-3-leon.hwang@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260219142933.13904-3-leon.hwang@linux.dev> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260219_140557_187569_F882F085 X-CRM114-Status: GOOD ( 12.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 | 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