Re: [PATCH v4 10/18] PM: EM: Add RCU mechanism which safely cleans the old data

[kernel test robot]

Hi Lukasz,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on rafael-pm/thermal linus/master v6.6-rc3 next-20230926]
[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/Lukasz-Luba/PM-EM-Add-missing-newline-for-the-message-log/20230925-181243
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20230925081139.1305766-11-lukasz.luba%40arm.com
patch subject: [PATCH v4 10/18] PM: EM: Add RCU mechanism which safely cleans the old data
config: i386-randconfig-063-20230926 (https://download.01.org/0day-ci/archive/20230926/202309261850.jrucSbN8-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230926/202309261850.jrucSbN8-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309261850.jrucSbN8-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> kernel/power/energy_model.c:125:13: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct em_perf_table *tmp @@     got struct em_perf_table [noderef] __rcu *runtime_table @@
   kernel/power/energy_model.c:125:13: sparse:     expected struct em_perf_table *tmp
   kernel/power/energy_model.c:125:13: sparse:     got struct em_perf_table [noderef] __rcu *runtime_table

vim +125 kernel/power/energy_model.c

   118	
   119	static void em_perf_runtime_table_set(struct device *dev,
   120					      struct em_perf_table *runtime_table)
   121	{
   122		struct em_perf_domain *pd = dev->em_pd;
   123		struct em_perf_table *tmp;
   124	
 > 125		tmp = pd->runtime_table;
   126	
   127		rcu_assign_pointer(pd->runtime_table, runtime_table);
   128	
   129		em_cpufreq_update_efficiencies(dev, runtime_table->state);
   130	
   131		/* Don't free default table since it's used by other frameworks. */
   132		if (tmp != pd->default_table)
   133			call_rcu(&tmp->rcu, em_destroy_rt_table_rcu);
   134	}
   135	

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