Re: [PATCH 4/9] perf/arm_dsu: Avoid explicit cpumask var allocation from stack

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

Hi Dawei,

kernel test robot noticed the following build errors:

[auto build test ERROR on soc/for-next]
[also build test ERROR on linus/master v6.9-rc2 next-20240402]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Dawei-Li/perf-alibaba_uncore_drw-Avoid-explicit-cpumask-var-allocation-from-stack/20240402-192244
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
patch link:    https://lore.kernel.org/r/20240402105610.1695644-5-dawei.li%40shingroup.cn
patch subject: [PATCH 4/9] perf/arm_dsu: Avoid explicit cpumask var allocation from stack
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20240403/202404030702.vL5Ep98R-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240403/202404030702.vL5Ep98R-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/202404030702.vL5Ep98R-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/perf/arm_dsu_pmu.c: In function 'dsu_pmu_get_online_cpu_any_but':
>> drivers/perf/arm_dsu_pmu.c:243:31: error: passing argument 1 of 'cpumask_any_but' from incompatible pointer type [-Werror=incompatible-pointer-types]
     243 |         ret = cpumask_any_but(&online_supported, cpu);
         |                               ^~~~~~~~~~~~~~~~~
         |                               |
         |                               struct cpumask (*)[1]
   In file included from arch/arm64/include/asm/cpufeature.h:26,
                    from arch/arm64/include/asm/ptrace.h:11,
                    from arch/arm64/include/asm/irqflags.h:10,
                    from include/linux/irqflags.h:18,
                    from include/linux/spinlock.h:59,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/slab.h:16,
                    from include/linux/resource_ext.h:11,
                    from include/linux/acpi.h:13,
                    from drivers/perf/arm_dsu_pmu.c:14:
   include/linux/cpumask.h:379:52: note: expected 'const struct cpumask *' but argument is of type 'struct cpumask (*)[1]'
     379 | unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
         |                              ~~~~~~~~~~~~~~~~~~~~~~^~~~
   cc1: some warnings being treated as errors


vim +/cpumask_any_but +243 drivers/perf/arm_dsu_pmu.c

   232	
   233	static unsigned int dsu_pmu_get_online_cpu_any_but(struct dsu_pmu *dsu_pmu, int cpu)
   234	{
   235		cpumask_var_t online_supported;
   236		unsigned int ret;
   237	
   238		if (!alloc_cpumask_var(&online_supported, GFP_KERNEL))
   239			return -ENOMEM;
   240	
   241		cpumask_and(online_supported,
   242			    &dsu_pmu->associated_cpus, cpu_online_mask);
 > 243		ret = cpumask_any_but(&online_supported, cpu);
   244	
   245		free_cpumask_var(online_supported);
   246	
   247		return ret;
   248	}
   249	

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