linux-kernel - drivers/cpufreq/cpufreq.c:475:17: sparse: sparse: incorrect type in assignment (different address spaces)

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Date:   Mon, 11 Dec 2023 17:03:24 +0800
From:   kernel test robot <philip.li@...el.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
CC:     <oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        "Palmer Dabbelt" <palmer@...osinc.com>,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: drivers/cpufreq/cpufreq.c:475:17: sparse: sparse: incorrect type in
 assignment (different address spaces)

Hi Lad,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3b47bc037bd44f142ac09848e8d3ecccc726be99
commit: effae0e3d9e1139d583e9b5d050f4f948825b8a3 riscv: Kconfig: Enable cpufreq kconfig menu
date:   1 year ago
:::::: branch date: 26 hours ago
:::::: commit date: 1 year ago
config: riscv-randconfig-r031-20230608 (https://download.01.org/0day-ci/archive/20231201/202312010059.MQ446XMR-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20231201/202312010059.MQ446XMR-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@...el.com>
| Closes: https://lore.kernel.org/r/202312010059.MQ446XMR-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   WARNING: invalid argument to '-march': '_zicbom_zihintpause'
>> drivers/cpufreq/cpufreq.c:475:17: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct notifier_block *nb @@     got struct notifier_block [noderef] __rcu *static [addressable] [toplevel] head @@
   drivers/cpufreq/cpufreq.c:475:17: sparse:     expected struct notifier_block *nb
   drivers/cpufreq/cpufreq.c:475:17: sparse:     got struct notifier_block [noderef] __rcu *static [addressable] [toplevel] head
>> drivers/cpufreq/cpufreq.c:475:65: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct notifier_block *nb @@     got struct notifier_block [noderef] __rcu *next @@
   drivers/cpufreq/cpufreq.c:475:65: sparse:     expected struct notifier_block *nb
   drivers/cpufreq/cpufreq.c:475:65: sparse:     got struct notifier_block [noderef] __rcu *next

vim +475 drivers/cpufreq/cpufreq.c

b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  466  
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  467  static void cpufreq_list_transition_notifiers(void)
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  468  {
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  469  	struct notifier_block *nb;
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  470  
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  471  	pr_info("Registered transition notifiers:\n");
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  472  
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  473  	mutex_lock(&cpufreq_transition_notifier_list.mutex);
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  474  
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30 @475  	for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next)
d75f773c86a2b8 Sakari Ailus      2019-03-25  476  		pr_info("%pS\n", nb->notifier_call);
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  477  
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  478  	mutex_unlock(&cpufreq_transition_notifier_list.mutex);
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  479  }
b7898fda5bc7e7 Rafael J. Wysocki 2016-03-30  480  

:::::: The code at line 475 was first introduced by commit
:::::: b7898fda5bc7e786e76ce24fbd2ec993b08ec518 cpufreq: Support for fast frequency switching

:::::: TO: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
:::::: CC: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki