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Subjectmm/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: 136057256686de39cc3a07c2e39ef6bc43003ff6
commit: b756a3b5e7ead8f6f4b03cea8ac22478ce04c8a8 mm: device exclusive memory access
date: 5 months ago
config: alpha-randconfig-s031-20211122 (https://download.01.org/0day-ci/archive/20211124/202111240450.3z7aF31U-lkp@intel.com/config.gz)
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 config file 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@intel.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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