[arm-perf:for-next/perf 14/15] drivers/perf/arm_cspmu/nvidia_cspmu.c:192:9: error: implicit declaration of function 'writel'

[arm-perf:for-next/perf 14/15] drivers/perf/arm_cspmu/nvidia_cspmu.c:192:9: error: implicit declaration of function 'writel'

[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: s390-allyesconfig (https://download.01.org/0day-ci/archive/20250315/202503152245.cAG4FMfi-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250315/202503152245.cAG4FMfi-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/202503152245.cAG4FMfi-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/perf/arm_cspmu/nvidia_cspmu.c: In function 'nv_cspmu_set_ev_filter':
>> drivers/perf/arm_cspmu/nvidia_cspmu.c:192:9: error: implicit declaration of function 'writel' [-Wimplicit-function-declaration]
     192 |         writel(filter, cspmu->base0 + offset);
         |         ^~~~~~


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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