Hi Ma, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: 929a9df37c1b7dec73fd417d79a116d02a8f9380 commit: f43933b3f947a7f9314ec8d704c6ae01041dbbba [2439/2439] arm64: cpufeature: Enable PBHA for stage1 early via FDT config: arm64-randconfig-004-20241117 (https://download.01.org/0day-ci/archive/20241203/202412031005.m61DNVfj-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241203/202412031005.m61DNVfj-lkp@i...) 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/202412031005.m61DNVfj-lkp@intel.com/ Note: functions only called from assembly code should be annotated with the asmlinkage attribute All warnings (new ones prefixed by >>): arch/arm64/kernel/cpufeature.c:1627:6: warning: no previous prototype for 'update_pbha_perf_only_bit' [-Wmissing-prototypes] 1627 | void update_pbha_perf_only_bit(const u8 *bits, int cnt) | ^~~~~~~~~~~~~~~~~~~~~~~~~

...

arch/arm64/kernel/cpufeature.c:1729:13: warning: no previous prototype for 'early_pbha_init' [-Wmissing-prototypes] 1729 | void __init early_pbha_init(void) | ^~~~~~~~~~~~~~~

vim +/early_pbha_init +1729 arch/arm64/kernel/cpufeature.c 1728

1729 void __init early_pbha_init(void) 1730 { 1731 void *fdt; 1732 int node; 1733 const u8 *prop; 1734 int size; 1735 1736 spin_lock(&pbha_dt_lock); 1737 1738 fdt = get_early_fdt_ptr(); 1739 if (!fdt) 1740 goto unlock; 1741 1742 node = fdt_path_offset(fdt, "/cpus"); 1743 if (node < 0) 1744 goto unlock; 1745 1746 prop = fdt_getprop(fdt, node, "arm,pbha-performance-only", &size); 1747 if (!prop) 1748 goto unlock; 1749 1750 if (!cpu_has_pbha()) 1751 goto unlock; 1752 1753 update_pbha_perf_only_bit(prop, size); 1754 enable_pbha_inner(); 1755 1756 pbha_enabled = true; 1757 1758 unlock: 1759 spin_unlock(&pbha_dt_lock); 1760 } 1761

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