Hi Yonghong, kernel test robot noticed the following build warnings: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Yonghong-Song/bpf-Allow-each-subprog-having-stack-size-of-512-bytes/20241018-063530 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20241017223214.3177977-1-yonghong.song%40linux.dev patch subject: [PATCH bpf-next v5 7/9] bpf, x86: Add jit support for private stack config: x86_64-randconfig-122-20241021 (https://download.01.org/0day-ci/archive/20241021/202410210358.dvPfsO1C-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241021/202410210358.dvPfsO1C-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202410210358.dvPfsO1C-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) >> arch/x86/net/bpf_jit_comp.c:1487:44: sparse: sparse: cast removes address space '__percpu' of expression arch/x86/net/bpf_jit_comp.c:1488:31: sparse: sparse: cast removes address space '__percpu' of expression arch/x86/net/bpf_jit_comp.c:2073:54: sparse: sparse: cast truncates bits from constant value (800000a00000 becomes a00000) vim +/__percpu +1487 arch/x86/net/bpf_jit_comp.c 1477 1478 static void emit_root_priv_frame_ptr(u8 **pprog, struct bpf_prog *bpf_prog, 1479 u32 orig_stack_depth) 1480 { 1481 void __percpu *priv_frame_ptr; 1482 u8 *prog = *pprog; 1483 1484 priv_frame_ptr = bpf_prog->aux->priv_stack_ptr + orig_stack_depth; 1485 1486 /* movabs r9, priv_frame_ptr */ > 1487 emit_mov_imm64(&prog, X86_REG_R9, (long) priv_frame_ptr >> 32, 1488 (u32) (long) priv_frame_ptr); 1489 #ifdef CONFIG_SMP 1490 /* add <r9>, gs:[<off>] */ 1491 EMIT2(0x65, 0x4c); 1492 EMIT3(0x03, 0x0c, 0x25); 1493 EMIT((u32)(unsigned long)&this_cpu_off, 4); 1494 #endif 1495 *pprog = prog; 1496 } 1497 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
