linux-kernel - mm/memory.c:709:25: sparse: sparse: cast to non-scalar

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Date:   Sat, 13 Nov 2021 00:01:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     Alistair Popple <apopple@...dia.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Dan Carpenter <error27@...il.com>,
        Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: mm/memory.c:709:25: sparse: sparse: cast to non-scalar

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5833291ab6de9c3e2374336b51c814e515e8f3a5
commit: b756a3b5e7ead8f6f4b03cea8ac22478ce04c8a8 mm: device exclusive memory access
date:   4 months ago
config: alpha-randconfig-s032-20211103 (attached as .config)
compiler: alpha-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b756a3b5e7ead8f6f4b03cea8ac22478ce04c8a8
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b756a3b5e7ead8f6f4b03cea8ac22478ce04c8a8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=alpha SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
>> mm/memory.c:709:25: sparse: sparse: cast to non-scalar
>> mm/memory.c:709:25: sparse: sparse: cast from non-scalar
   mm/memory.c:1023:17: sparse: sparse: context imbalance in 'copy_pte_range' - different lock contexts for basic block
   mm/memory.c:1736:16: sparse: sparse: context imbalance in '__get_locked_pte' - different lock contexts for basic block
   mm/memory.c:1785:9: sparse: sparse: context imbalance in 'insert_page' - different lock contexts for basic block
   mm/memory.c:2287:17: sparse: sparse: context imbalance in 'remap_pte_range' - different lock contexts for basic block
   mm/memory.c:2543:17: sparse: sparse: context imbalance in 'apply_to_pte_range' - unexpected unlock
   mm/memory.c:2831:17: sparse: sparse: context imbalance in 'wp_page_copy' - unexpected unlock
   mm/memory.c:3180:17: sparse: sparse: context imbalance in 'wp_pfn_shared' - unexpected unlock
   mm/memory.c:3243:19: sparse: sparse: context imbalance in 'do_wp_page' - different lock contexts for basic block
   mm/memory.c: note: in included file (through include/linux/mm.h, arch/alpha/include/asm/io.h, include/linux/io.h, include/linux/irq.h, ...):
   include/linux/pgtable.h:275:16: sparse: sparse: cast to non-scalar
   include/linux/pgtable.h:275:16: sparse: sparse: cast from non-scalar
   mm/memory.c:4874:5: sparse: sparse: context imbalance in 'follow_invalidate_pte' - different lock contexts for basic block
   mm/memory.c:4995:9: sparse: sparse: context imbalance in 'follow_pfn' - unexpected unlock

vim +709 mm/memory.c

   701	
   702	static void restore_exclusive_pte(struct vm_area_struct *vma,
   703					  struct page *page, unsigned long address,
   704					  pte_t *ptep)
   705	{
   706		pte_t pte;
   707		swp_entry_t entry;
   708	
 > 709		pte = pte_mkold(mk_pte(page, READ_ONCE(vma->vm_page_prot)));
   710		if (pte_swp_soft_dirty(*ptep))
   711			pte = pte_mksoft_dirty(pte);
   712	
   713		entry = pte_to_swp_entry(*ptep);
   714		if (pte_swp_uffd_wp(*ptep))
   715			pte = pte_mkuffd_wp(pte);
   716		else if (is_writable_device_exclusive_entry(entry))
   717			pte = maybe_mkwrite(pte_mkdirty(pte), vma);
   718	
   719		set_pte_at(vma->vm_mm, address, ptep, pte);
   720	
   721		/*
   722		 * No need to take a page reference as one was already
   723		 * created when the swap entry was made.
   724		 */
   725		if (PageAnon(page))
   726			page_add_anon_rmap(page, vma, address, false);
   727		else
   728			/*
   729			 * Currently device exclusive access only supports anonymous
   730			 * memory so the entry shouldn't point to a filebacked page.
   731			 */
   732			WARN_ON_ONCE(!PageAnon(page));
   733	
   734		if (vma->vm_flags & VM_LOCKED)
   735			mlock_vma_page(page);
   736	
   737		/*
   738		 * No need to invalidate - it was non-present before. However
   739		 * secondary CPUs may have mappings that need invalidating.
   740		 */
   741		update_mmu_cache(vma, address, ptep);
   742	}
   743	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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