Re: [PATCH 1/2] padata: add pd get/put refcnt helper

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

Hi Chen,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.12 next-20241126]
[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/Chen-Ridong/padata-add-pd-get-put-refcnt-helper/20241125-111043
base:   linus/master
patch link:    https://lore.kernel.org/r/20241123080509.2573987-2-chenridong%40huaweicloud.com
patch subject: [PATCH 1/2] padata: add pd get/put refcnt helper
config: x86_64-randconfig-122-20241125 (https://download.01.org/0day-ci/archive/20241126/202411261818.iINyAe83-lkp@intel.com/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/20241126/202411261818.iINyAe83-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/202411261818.iINyAe83-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> kernel/padata.c:1142:25: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct parallel_data *pd @@     got struct parallel_data [noderef] __rcu *pd @@
   kernel/padata.c:1142:25: sparse:     expected struct parallel_data *pd
   kernel/padata.c:1142:25: sparse:     got struct parallel_data [noderef] __rcu *pd
   kernel/padata.c: note: in included file (through include/linux/swait.h, include/linux/completion.h):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true

vim +1142 kernel/padata.c

  1126	
  1127	/**
  1128	 * padata_free_shell - free a padata shell
  1129	 *
  1130	 * @ps: padata shell to free
  1131	 */
  1132	void padata_free_shell(struct padata_shell *ps)
  1133	{
  1134		struct parallel_data *pd;
  1135	
  1136		if (!ps)
  1137			return;
  1138	
  1139		mutex_lock(&ps->pinst->lock);
  1140		list_del(&ps->list);
  1141		pd = rcu_dereference_protected(ps->pd, 1);
> 1142		padata_put_pd(ps->pd);
  1143		mutex_unlock(&ps->pinst->lock);
  1144	
  1145		kfree(ps);
  1146	}
  1147	EXPORT_SYMBOL(padata_free_shell);
  1148	

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