Re: [PATCH v3 05/11] vduse: Support automatic irq callback affinity

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

Hi Xie,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/irq/core]
[also build test WARNING on linus/master next-20230228]
[cannot apply to mst-vhost/linux-next v6.2]
[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/Xie-Yongji/lib-group_cpus-Export-group_cpus_evenly/20230228-174438
patch link:    https://lore.kernel.org/r/20230228094110.37-6-xieyongji%40bytedance.com
patch subject: [PATCH v3 05/11] vduse: Support automatic irq callback affinity
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230228/202302281954.jRA7Qzq4-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/6c15cc28cb814c0e6cb80955bc59517e80c15ae2
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Xie-Yongji/lib-group_cpus-Export-group_cpus_evenly/20230228-174438
        git checkout 6c15cc28cb814c0e6cb80955bc59517e80c15ae2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/vdpa/vdpa_user/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302281954.jRA7Qzq4-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/vdpa/vdpa_user/vduse_dev.c:725:1: warning: no previous prototype for 'create_affinity_masks' [-Wmissing-prototypes]
     725 | create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
         | ^~~~~~~~~~~~~~~~~~~~~


vim +/create_affinity_masks +725 drivers/vdpa/vdpa_user/vduse_dev.c

   723	
   724	struct cpumask *
 > 725	create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
   726	{
   727		unsigned int affvecs = 0, curvec, usedvecs, i;
   728		struct cpumask *masks = NULL;
   729	
   730		if (nvecs > affd->pre_vectors + affd->post_vectors)
   731			affvecs = nvecs - affd->pre_vectors - affd->post_vectors;
   732	
   733		if (!affd->calc_sets)
   734			affd->calc_sets = default_calc_sets;
   735	
   736		affd->calc_sets(affd, affvecs);
   737	
   738		if (!affvecs)
   739			return NULL;
   740	
   741		masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
   742		if (!masks)
   743			return NULL;
   744	
   745		/* Fill out vectors at the beginning that don't need affinity */
   746		for (curvec = 0; curvec < affd->pre_vectors; curvec++)
   747			cpumask_setall(&masks[curvec]);
   748	
   749		for (i = 0, usedvecs = 0; i < affd->nr_sets; i++) {
   750			unsigned int this_vecs = affd->set_size[i];
   751			int j;
   752			struct cpumask *result = group_cpus_evenly(this_vecs);
   753	
   754			if (!result) {
   755				kfree(masks);
   756				return NULL;
   757			}
   758	
   759			for (j = 0; j < this_vecs; j++)
   760				cpumask_copy(&masks[curvec + j], &result[j]);
   761			kfree(result);
   762	
   763			curvec += this_vecs;
   764			usedvecs += this_vecs;
   765		}
   766	
   767		/* Fill out vectors at the end that don't need affinity */
   768		if (usedvecs >= affvecs)
   769			curvec = affd->pre_vectors + affvecs;
   770		else
   771			curvec = affd->pre_vectors + usedvecs;
   772		for (; curvec < nvecs; curvec++)
   773			cpumask_setall(&masks[curvec]);
   774	
   775		return masks;
   776	}
   777	

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