[openeuler:OLK-6.6 3541/3541] drivers/cpufreq/cppc_cpufreq.c:852:19: error: incomplete definition of type 'struct fb_ctr_pair'

[kernel test robot <lkp@intel.com>]

Hi Zeng,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   cd9eb9b4365b71652b2c2ac58293bea47c9f9302
commit: 12f136b2134d4ded731c3ef23ac08c85b9c0b1fa [3541/3541] cpufreq: CPPC: Keep the target core awake when reading its cpufreq rate
config: arm64-randconfig-002-20251212 (https://download.01.org/0day-ci/archive/20251212/202512122204.MoIXLFAZ-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251212/202512122204.MoIXLFAZ-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/202512122204.MoIXLFAZ-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/cpufreq/cppc_cpufreq.c:28:
   In file included from include/acpi/cppc_acpi.h:13:
   In file included from include/linux/acpi.h:37:
   In file included from include/acpi/acpi_io.h:7:
   In file included from arch/arm64/include/asm/acpi.h:14:
   In file included from include/linux/memblock.h:12:
   In file included from include/linux/mm.h:2181:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/cpufreq/cppc_cpufreq.c:852:19: error: incomplete definition of type 'struct fb_ctr_pair'
     852 |         int cpu = fb_ctrs->cpu;
         |                   ~~~~~~~^
   drivers/cpufreq/cppc_cpufreq.c:851:9: note: forward declaration of 'struct fb_ctr_pair'
     851 |         struct fb_ctr_pair *fb_ctrs = val;
         |                ^
   drivers/cpufreq/cppc_cpufreq.c:855:40: error: incomplete definition of type 'struct fb_ctr_pair'
     855 |         ret = cppc_get_perf_ctrs(cpu, &fb_ctrs->fb_ctrs_t0);
         |                                        ~~~~~~~^
   drivers/cpufreq/cppc_cpufreq.c:851:9: note: forward declaration of 'struct fb_ctr_pair'
     851 |         struct fb_ctr_pair *fb_ctrs = val;
         |                ^
   drivers/cpufreq/cppc_cpufreq.c:861:41: error: incomplete definition of type 'struct fb_ctr_pair'
     861 |         return cppc_get_perf_ctrs(cpu, &fb_ctrs->fb_ctrs_t1);
         |                                         ~~~~~~~^
   drivers/cpufreq/cppc_cpufreq.c:851:9: note: forward declaration of 'struct fb_ctr_pair'
     851 |         struct fb_ctr_pair *fb_ctrs = val;
         |                ^
   drivers/cpufreq/cppc_cpufreq.c:866:21: error: variable has incomplete type 'struct fb_ctr_pair'
     866 |         struct fb_ctr_pair fb_ctrs = { .cpu = cpu, };
         |                            ^
   drivers/cpufreq/cppc_cpufreq.c:866:9: note: forward declaration of 'struct fb_ctr_pair'
     866 |         struct fb_ctr_pair fb_ctrs = { .cpu = cpu, };
         |                ^
   1 warning and 4 errors generated.


vim +852 drivers/cpufreq/cppc_cpufreq.c

   848	
   849	static int cppc_get_perf_ctrs_pair(void *val)
   850	{
   851		struct fb_ctr_pair *fb_ctrs = val;
 > 852		int cpu = fb_ctrs->cpu;
   853		int ret;
   854	
   855		ret = cppc_get_perf_ctrs(cpu, &fb_ctrs->fb_ctrs_t0);
   856		if (ret)
   857			return ret;
   858	
   859		udelay(2); /* 2usec delay between sampling */
   860	
   861		return cppc_get_perf_ctrs(cpu, &fb_ctrs->fb_ctrs_t1);
   862	}
   863	

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