[arm-perf:for-next/perf 14/15] drivers/perf/arm_cspmu/nvidia_cspmu.c:192:2: error: call to undeclared function 'writel'; ISO C99 and later do not support implicit function declarations

[arm-perf:for-next/perf 14/15] drivers/perf/arm_cspmu/nvidia_cspmu.c:192:2: error: call to undeclared function 'writel'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git for-next/perf
head:   a28f3cbfd11fcb13f826b33a4799c2ac77e70729
commit: 6de0298a3925f1e6e313430c45ae314a93f89ef6 [14/15] perf/arm_cspmu: Generalise event filtering
config: x86_64-buildonly-randconfig-002-20250315 (https://download.01.org/0day-ci/archive/20250315/202503150649.Dol8RBSh-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/20250315/202503150649.Dol8RBSh-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/202503150649.Dol8RBSh-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/perf/arm_cspmu/nvidia_cspmu.c:192:2: error: call to undeclared function 'writel'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     192 |         writel(filter, cspmu->base0 + offset);
         |         ^
   drivers/perf/arm_cspmu/nvidia_cspmu.c:200:2: error: call to undeclared function 'writel'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     200 |         writel(filter, cspmu->base0 + PMCCFILTR);
         |         ^
   2 errors generated.


vim +/writel +192 drivers/perf/arm_cspmu/nvidia_cspmu.c

   185	
   186	static void nv_cspmu_set_ev_filter(struct arm_cspmu *cspmu,
   187					   const struct perf_event *event)
   188	{
   189		u32 filter = nv_cspmu_event_filter(event);
   190		u32 offset = PMEVFILTR + (4 * event->hw.idx);
   191	
 > 192		writel(filter, cspmu->base0 + offset);
   193	}
   194	

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