Hi liuyun, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 429a19874eb589d27346ba7363fa091d7e4ff99a commit: db5bb24abc8dd120fd81b7ce21819e96578d011e [1562/1562] LoongArch: Old BPI compatibility config: loongarch-randconfig-r064-20241129 (https://download.01.org/0day-ci/archive/20241130/202411300409.9tXI7K0F-lkp@i...) compiler: loongarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241130/202411300409.9tXI7K0F-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/202411300409.9tXI7K0F-lkp@intel.com/ All errors (new ones prefixed by >>): arch/loongarch/kernel/legacy_boot.c:94:6: warning: no previous prototype for 'register_default_pic' [-Wmissing-prototypes] 94 | void register_default_pic(int id, u32 address, u32 irq_base) | ^~~~~~~~~~~~~~~~~~~~ arch/loongarch/kernel/legacy_boot.c: In function 'register_default_pic':

...

arch/loongarch/kernel/legacy_boot.c:106:48: error: implicit declaration of function 'nid_to_addrbase' [-Wimplicit-function-declaration] 106 | pchpic_default[idx].address |= nid_to_addrbase(id) | HT1LO_OFFSET; | ^~~~~~~~~~~~~~~ arch/loongarch/kernel/legacy_boot.c: At top level: arch/loongarch/kernel/legacy_boot.c:242:13: warning: no previous prototype for 'fw_init_cmdline' [-Wmissing-prototypes] 242 | __init void fw_init_cmdline(unsigned long argc, unsigned long cmdp) | ^~~~~~~~~~~~~~~ arch/loongarch/kernel/legacy_boot.c:341:14: warning: no previous prototype for 'bpi_init' [-Wmissing-prototypes] 341 | unsigned int bpi_init(void) | ^~~~~~~~

vim +/nid_to_addrbase +106 arch/loongarch/kernel/legacy_boot.c 93 94 void register_default_pic(int id, u32 address, u32 irq_base) 95 { 96 int idx, entries; 97 unsigned long addr; 98 99 if (bad_pch_pic(address)) 100 return; 101 102 idx = nr_io_pics; 103 104 pchpic_default[idx].address = address; 105 if (idx)

106 pchpic_default[idx].address |= nid_to_addrbase(id) | HT1LO_OFFSET; 107 pchpic_default[idx].id = id; 108 pchpic_default[idx].version = 0; 109 pchpic_default[idx].size = 0x1000; 110 pchpic_default[idx].gsi_base = irq_base; 111 112 msi_group[nr_io_pics].pci_segment = nr_io_pics; 113 pch_group[nr_io_pics].node = msi_group[nr_io_pics].node = id; 114 115 addr = pchpic_default[idx].address; 116 /* Read INT_ID.int_num */ 117 entries = (((unsigned long)ls7a_readq(addr) >> 48) & 0xff) + 1; 118 pchmsi_default[idx].msg_address = MSI_MSG_ADDRESS; 119 pchmsi_default[idx].start = entries; 120 pchmsi_default[idx].count = MSI_MSG_DEFAULT_COUNT; 121 122 eiointc_default[idx].cascade = 3; 123 eiointc_default[idx].node = id; 124 eiointc_default[idx].node_map = 1; 125 126 if (idx) { 127 eiointc_default[idx].cascade = 0x4; 128 eiointc_default[0].node_map = 0x1DF; 129 eiointc_default[idx].node_map = 0xFE20; 130 } 131 132 acpi_pchpic[idx] = &pchpic_default[idx]; 133 acpi_pchmsi[idx] = &pchmsi_default[idx]; 134 acpi_eiointc[idx] = &eiointc_default[idx]; 135 136 nr_io_pics++; 137 } 138

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