[akpm-mm:mm-new 159/160] include/linux/mmzone.h:2052:18: sparse: sparse: incorrect type in return expression (different address spaces)

[akpm-mm:mm-new 159/160] include/linux/mmzone.h:2052:18: sparse: sparse: incorrect type in return expression (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
head:   f358e95febcb2f3d7ac6aafab0a2b9ace9cc8b7c
commit: 085038a33b6f00e4c43cceab8116315d1d42380c [159/160] mm/sparse: fix race on mem_section->usage in pfn walkers
config: i386-randconfig-r132-20260415 (https://download.01.org/0day-ci/archive/20260415/202604152138.zbTaYxbG-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260415/202604152138.zbTaYxbG-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/202604152138.zbTaYxbG-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   mm/sparse.c: note: in included file:
>> mm/internal.h:987:19: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct mem_section_usage [noderef] __rcu *usage @@     got struct mem_section_usage *usage @@
   mm/internal.h:987:19: sparse:     expected struct mem_section_usage [noderef] __rcu *usage
   mm/internal.h:987:19: sparse:     got struct mem_section_usage *usage
--
   mm/page_alloc.c: note: in included file (through include/linux/gfp.h, include/linux/mm.h):
>> include/linux/mmzone.h:2052:18: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected unsigned long * @@     got unsigned long [noderef] __rcu * @@
   include/linux/mmzone.h:2052:18: sparse:     expected unsigned long *
   include/linux/mmzone.h:2052:18: sparse:     got unsigned long [noderef] __rcu *
>> include/linux/mmzone.h:2052:18: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected unsigned long * @@     got unsigned long [noderef] __rcu * @@
   include/linux/mmzone.h:2052:18: sparse:     expected unsigned long *
   include/linux/mmzone.h:2052:18: sparse:     got unsigned long [noderef] __rcu *
>> include/linux/mmzone.h:2052:18: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected unsigned long * @@     got unsigned long [noderef] __rcu * @@
   include/linux/mmzone.h:2052:18: sparse:     expected unsigned long *
   include/linux/mmzone.h:2052:18: sparse:     got unsigned long [noderef] __rcu *
>> include/linux/mmzone.h:2052:18: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected unsigned long * @@     got unsigned long [noderef] __rcu * @@
   include/linux/mmzone.h:2052:18: sparse:     expected unsigned long *
   include/linux/mmzone.h:2052:18: sparse:     got unsigned long [noderef] __rcu *
>> include/linux/mmzone.h:2052:18: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected unsigned long * @@     got unsigned long [noderef] __rcu * @@
   include/linux/mmzone.h:2052:18: sparse:     expected unsigned long *
   include/linux/mmzone.h:2052:18: sparse:     got unsigned long [noderef] __rcu *

vim +2052 include/linux/mmzone.h

d41dee369bff3b Andy Whitcroft 2005-06-23  2049  
f1eca35a0dc7cb Dan Williams   2019-07-18  2050  static inline unsigned long *section_to_usemap(struct mem_section *ms)
f1eca35a0dc7cb Dan Williams   2019-07-18  2051  {
f1eca35a0dc7cb Dan Williams   2019-07-18 @2052  	return ms->usage->pageblock_flags;
f1eca35a0dc7cb Dan Williams   2019-07-18  2053  }
f1eca35a0dc7cb Dan Williams   2019-07-18  2054  

:::::: The code at line 2052 was first introduced by commit
:::::: f1eca35a0dc7cb3cdb00c88c8c5e5138a65face0 mm/sparsemem: introduce struct mem_section_usage

:::::: TO: Dan Williams <dan.j.williams@intel.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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