[thomas-weissschuh:b4/b4-sysfs-const-attr-device_attr 7/12] drivers/perf/nvidia_t410_cmem_latency_pmu.c:447:25: error: incompatible function pointer types initializing 'ssize_t (*)(struct device *, struct device_attribute *, char *)' (aka 'long (*)(struct device *, struct device_attribute *, char *)') with an expr...

[thomas-weissschuh:b4/b4-sysfs-const-attr-device_attr 7/12] drivers/perf/nvidia_t410_cmem_latency_pmu.c:447:25: error: incompatible function pointer types initializing 'ssize_t (*)(struct device *, struct device_attribute *, char *)' (aka 'long (*)(struct device *, struct device_attribute *, char *)') with an expr...

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/b4-sysfs-const-attr-device_attr
head:   bc80ee47805905a6b1e67acf7d467ba57ffb6e7f
commit: 858ac3375fd495c1c894b364cae0f98d8ce471a9 [7/12] device_string
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20260624/202606241123.ZtjpkcdO-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project a9b492db3d50683e446cd1a5c9ffaf4e92cb77a7)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260624/202606241123.ZtjpkcdO-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/202606241123.ZtjpkcdO-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/perf/nvidia_t410_cmem_latency_pmu.c:447:25: error: incompatible function pointer types initializing 'ssize_t (*)(struct device *, struct device_attribute *, char *)' (aka 'long (*)(struct device *, struct device_attribute *, char *)') with an expression of type 'ssize_t (struct device *, const struct device_attribute *, char *)' (aka 'long (struct device *, const struct device_attribute *, char *)') [-Wincompatible-function-pointer-types]
     447 |         NV_PMU_EXT_ATTR(event, device_show_string, "config:0-1"),
         |                                ^~~~~~~~~~~~~~~~~~
   1 error generated.
--
>> drivers/perf/nvidia_t410_c2c_pmu.c:560:2: error: incompatible function pointer types initializing 'ssize_t (*)(struct device *, struct device_attribute *, char *)' (aka 'long (*)(struct device *, struct device_attribute *, char *)') with an expression of type 'ssize_t (struct device *, const struct device_attribute *, char *)' (aka 'long (struct device *, const struct device_attribute *, char *)') [-Wincompatible-function-pointer-types]
     560 |         NV_C2C_PMU_FORMAT_EVENT_ATTR,
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/perf/nvidia_t410_c2c_pmu.c:557:2: note: expanded from macro 'NV_C2C_PMU_FORMAT_EVENT_ATTR'
     557 |         NV_C2C_PMU_FORMAT_ATTR(event, "config:0-3")
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/perf/nvidia_t410_c2c_pmu.c:554:29: note: expanded from macro 'NV_C2C_PMU_FORMAT_ATTR'
     554 |         NV_C2C_PMU_EXT_ATTR(_name, device_show_string, _config)
         |                                    ^~~~~~~~~~~~~~~~~~
   drivers/perf/nvidia_t410_c2c_pmu.c:561:2: error: incompatible function pointer types initializing 'ssize_t (*)(struct device *, struct device_attribute *, char *)' (aka 'long (*)(struct device *, struct device_attribute *, char *)') with an expression of type 'ssize_t (struct device *, const struct device_attribute *, char *)' (aka 'long (struct device *, const struct device_attribute *, char *)') [-Wincompatible-function-pointer-types]
     561 |         NV_C2C_PMU_FORMAT_ATTR(gpu_mask, "config1:0-1"),
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/perf/nvidia_t410_c2c_pmu.c:554:29: note: expanded from macro 'NV_C2C_PMU_FORMAT_ATTR'
     554 |         NV_C2C_PMU_EXT_ATTR(_name, device_show_string, _config)
         |                                    ^~~~~~~~~~~~~~~~~~
   drivers/perf/nvidia_t410_c2c_pmu.c:571:2: error: incompatible function pointer types initializing 'ssize_t (*)(struct device *, struct device_attribute *, char *)' (aka 'long (*)(struct device *, struct device_attribute *, char *)') with an expression of type 'ssize_t (struct device *, const struct device_attribute *, char *)' (aka 'long (struct device *, const struct device_attribute *, char *)') [-Wincompatible-function-pointer-types]
     571 |         NV_C2C_PMU_FORMAT_EVENT_ATTR,
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/perf/nvidia_t410_c2c_pmu.c:557:2: note: expanded from macro 'NV_C2C_PMU_FORMAT_EVENT_ATTR'
     557 |         NV_C2C_PMU_FORMAT_ATTR(event, "config:0-3")
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/perf/nvidia_t410_c2c_pmu.c:554:29: note: expanded from macro 'NV_C2C_PMU_FORMAT_ATTR'
     554 |         NV_C2C_PMU_EXT_ATTR(_name, device_show_string, _config)
         |                                    ^~~~~~~~~~~~~~~~~~
   3 errors generated.


vim +447 drivers/perf/nvidia_t410_cmem_latency_pmu.c

429b7638b2df55 Besar Wicaksono 2026-03-24  437  
429b7638b2df55 Besar Wicaksono 2026-03-24  438  #define NV_PMU_EXT_ATTR(_name, _func, _config)			\
429b7638b2df55 Besar Wicaksono 2026-03-24  439  	(&((struct dev_ext_attribute[]){				\
429b7638b2df55 Besar Wicaksono 2026-03-24  440  		{							\
429b7638b2df55 Besar Wicaksono 2026-03-24  441  			.attr = __ATTR(_name, 0444, _func, NULL),	\
429b7638b2df55 Besar Wicaksono 2026-03-24  442  			.var = (void *)_config				\
429b7638b2df55 Besar Wicaksono 2026-03-24  443  		}							\
429b7638b2df55 Besar Wicaksono 2026-03-24  444  	})[0].attr.attr)
429b7638b2df55 Besar Wicaksono 2026-03-24  445  
429b7638b2df55 Besar Wicaksono 2026-03-24  446  static struct attribute *cmem_lat_pmu_formats[] = {
429b7638b2df55 Besar Wicaksono 2026-03-24 @447  	NV_PMU_EXT_ATTR(event, device_show_string, "config:0-1"),
429b7638b2df55 Besar Wicaksono 2026-03-24  448  	NULL
429b7638b2df55 Besar Wicaksono 2026-03-24  449  };
429b7638b2df55 Besar Wicaksono 2026-03-24  450  

:::::: The code at line 447 was first introduced by commit
:::::: 429b7638b2df5538e945aaa2cc189cf0d6e8fb3a perf: add NVIDIA Tegra410 CPU Memory Latency PMU

:::::: TO: Besar Wicaksono <bwicaksono@nvidia.com>
:::::: CC: Will Deacon <will@kernel.org>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki