[akpm-mm:mm-new 163/164] mm/bootmem_info.c:58:15: sparse: sparse: incorrect type in assignment (different address spaces)

[akpm-mm:mm-new 163/164] mm/bootmem_info.c:58:15: sparse: sparse: incorrect type in assignment (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
head:   ee03ca7d1cb1223d0e14dfd3b48478545af75253
commit: 8568f268a5183e0fd5fbd33569b6513038b62f27 [163/164] mm/sparse: fix race on mem_section->usage in pfn walkers
config: x86_64-randconfig-r131-20260417 (https://download.01.org/0day-ci/archive/20260417/202604171841.MGvqbmu8-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/20260417/202604171841.MGvqbmu8-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/202604171841.MGvqbmu8-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> mm/bootmem_info.c:58:15: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct mem_section_usage *usage @@     got struct mem_section_usage [noderef] __rcu *usage @@
   mm/bootmem_info.c:58:15: sparse:     expected struct mem_section_usage *usage
   mm/bootmem_info.c:58:15: sparse:     got struct mem_section_usage [noderef] __rcu *usage

vim +58 mm/bootmem_info.c

426e5c429d16e4c Muchun Song             2021-06-30  42  
cdcfc631c80e716 Muchun Song             2021-09-02  43  static void __init register_page_bootmem_info_section(unsigned long start_pfn)
426e5c429d16e4c Muchun Song             2021-06-30  44  {
426e5c429d16e4c Muchun Song             2021-06-30  45  	unsigned long mapsize, section_nr, i;
426e5c429d16e4c Muchun Song             2021-06-30  46  	struct mem_section *ms;
426e5c429d16e4c Muchun Song             2021-06-30  47  	struct mem_section_usage *usage;
7f8e592bb3271ea David Hildenbrand (Arm  2026-03-20  48) 	struct page *page;
426e5c429d16e4c Muchun Song             2021-06-30  49  
7f8e592bb3271ea David Hildenbrand (Arm  2026-03-20  50) 	start_pfn = SECTION_ALIGN_DOWN(start_pfn);
426e5c429d16e4c Muchun Song             2021-06-30  51  	section_nr = pfn_to_section_nr(start_pfn);
426e5c429d16e4c Muchun Song             2021-06-30  52  	ms = __nr_to_section(section_nr);
426e5c429d16e4c Muchun Song             2021-06-30  53  
d65917c42373f70 Frank van der Linden    2025-02-28  54  	if (!preinited_vmemmap_section(ms))
7f8e592bb3271ea David Hildenbrand (Arm  2026-03-20  55) 		register_page_bootmem_memmap(section_nr, pfn_to_page(start_pfn),
d65917c42373f70 Frank van der Linden    2025-02-28  56  					     PAGES_PER_SECTION);
426e5c429d16e4c Muchun Song             2021-06-30  57  
426e5c429d16e4c Muchun Song             2021-06-30 @58  	usage = ms->usage;
426e5c429d16e4c Muchun Song             2021-06-30  59  	page = virt_to_page(usage);
426e5c429d16e4c Muchun Song             2021-06-30  60  
426e5c429d16e4c Muchun Song             2021-06-30  61  	mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT;
426e5c429d16e4c Muchun Song             2021-06-30  62  
426e5c429d16e4c Muchun Song             2021-06-30  63  	for (i = 0; i < mapsize; i++, page++)
426e5c429d16e4c Muchun Song             2021-06-30  64  		get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
426e5c429d16e4c Muchun Song             2021-06-30  65  }
426e5c429d16e4c Muchun Song             2021-06-30  66  

:::::: The code at line 58 was first introduced by commit
:::::: 426e5c429d16e4cd5ded46e21ff8e939bf8abd0f mm: memory_hotplug: factor out bootmem core functions to bootmem_info.c

:::::: TO: Muchun Song <songmuchun@bytedance.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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