Re: [PATCH net-next 1/2] net: make default_rps_mask a per netns attribute

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

Hi Paolo,

I love your patch! Yet something to improve:

[auto build test ERROR on net-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Paolo-Abeni/net-make-default_rps_mask-a-per-netns-attribute/20230216-023751
patch link:    https://lore.kernel.org/r/35bde791a3fd775f0a027bba04a549233b705494.1676484775.git.pabeni%40redhat.com
patch subject: [PATCH net-next 1/2] net: make default_rps_mask a per netns attribute
config: parisc-defconfig (https://download.01.org/0day-ci/archive/20230216/202302162052.Pm80BWt6-lkp@intel.com/config)
compiler: hppa-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/7b0e8effb3c7ac131c0da6e37cc33322ff22e2e3
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Paolo-Abeni/net-make-default_rps_mask-a-per-netns-attribute/20230216-023751
        git checkout 7b0e8effb3c7ac131c0da6e37cc33322ff22e2e3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash

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/202302162052.Pm80BWt6-lkp@intel.com/

All errors (new ones prefixed by >>):

   net/core/sysctl_net_core.c: In function 'rps_default_mask_cow_alloc':
>> net/core/sysctl_net_core.c:85:33: error: passing argument 1 of 'zalloc_cpumask_var' from incompatible pointer type [-Werror=incompatible-pointer-types]
      85 |         if (!zalloc_cpumask_var(&rps_default_mask, GFP_KERNEL))
         |                                 ^~~~~~~~~~~~~~~~~
         |                                 |
         |                                 struct cpumask **
   In file included from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:63,
                    from include/linux/debugobjects.h:6,
                    from include/linux/timer.h:8,
                    from include/linux/workqueue.h:9,
                    from include/linux/bpf.h:10,
                    from include/linux/filter.h:9,
                    from net/core/sysctl_net_core.c:9:
   include/linux/cpumask.h:897:54: note: expected 'struct cpumask (*)[1]' but argument is of type 'struct cpumask **'
     897 | static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
         |                                       ~~~~~~~~~~~~~~~^~~~
   cc1: some warnings being treated as errors


vim +/zalloc_cpumask_var +85 net/core/sysctl_net_core.c

    77	
    78	static struct cpumask *rps_default_mask_cow_alloc(struct net *net)
    79	{
    80		struct cpumask *rps_default_mask;
    81	
    82		if (net->core.rps_default_mask)
    83			return net->core.rps_default_mask;
    84	
  > 85		if (!zalloc_cpumask_var(&rps_default_mask, GFP_KERNEL))
    86			return NULL;
    87	
    88		/* pairs with READ_ONCE in rx_queue_default_mask() */
    89		WRITE_ONCE(net->core.rps_default_mask, rps_default_mask);
    90		return rps_default_mask;
    91	}
    92	

-- 
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