[openeuler:openEuler-1.0-LTS 1355/1355] include/linux/share_pool.h:150:26: sparse: sparse: incorrect type in return expression (different address spaces)

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

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   773f731853f1368508a0b112047bd9b5a4bb9a5e
commit: 4a280fac30d27ae2aff096f9f99aa12d50f83426 [1355/1355] ascend: share_pool: support share pool features for ascend platform
config: arm64-randconfig-r133-20241227 (https://download.01.org/0day-ci/archive/20241228/202412281933.AtwopaHj-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.2.0
reproduce: (https://download.01.org/0day-ci/archive/20241228/202412281933.AtwopaHj-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/202412281933.AtwopaHj-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   mm/gup.c: note: in included file:
>> include/linux/share_pool.h:150:26: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected struct task_struct * @@     got struct task_struct [noderef] __rcu *owner @@
   include/linux/share_pool.h:150:26: sparse:     expected struct task_struct *
   include/linux/share_pool.h:150:26: sparse:     got struct task_struct [noderef] __rcu *owner
   mm/gup.c:1769:47: sparse: sparse: self-comparison always evaluates to false
   mm/gup.c:1794:47: sparse: sparse: self-comparison always evaluates to false
   mm/gup.c:1830:6: warning: no previous prototype for 'gup_fast_permitted' [-Wmissing-prototypes]
    1830 | bool gup_fast_permitted(unsigned long start, int nr_pages, int write)
         |      ^~~~~~~~~~~~~~~~~~

vim +150 include/linux/share_pool.h

2facb5901ceebe Ding Tianhong 2021-10-30  146  
2facb5901ceebe Ding Tianhong 2021-10-30  147  static inline struct task_struct *sp_get_task(struct mm_struct *mm)
2facb5901ceebe Ding Tianhong 2021-10-30  148  {
2facb5901ceebe Ding Tianhong 2021-10-30  149  	if (enable_ascend_share_pool)
2facb5901ceebe Ding Tianhong 2021-10-30 @150  		return mm->owner;
2facb5901ceebe Ding Tianhong 2021-10-30  151  	else
2facb5901ceebe Ding Tianhong 2021-10-30  152  		return current;
2facb5901ceebe Ding Tianhong 2021-10-30  153  }
2facb5901ceebe Ding Tianhong 2021-10-30  154  

:::::: The code at line 150 was first introduced by commit
:::::: 2facb5901ceebe6736c0d192ca50be5d26c70ad9 ascend: vmalloc: export new function for share pool

:::::: TO: Ding Tianhong <dingtianhong@huawei.com>
:::::: CC: Yang Yingliang <yangyingliang@huawei.com>

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