tree: https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next.holder_stealing2 head: 6af2ffaed52783f15505255e62c43d2083a4a3a2 commit: 14d6ca0628042b7be9c06df73fef131d3a98473a [5/13] iov_iter: Introduce fault_in_iov_iter_writeable config: arc-randconfig-s032-20210803 (attached as .config) compiler: arceb-elf-gcc (GCC) 10.3.0 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: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/commit/?id=14d6ca0628042b7be9c06df73fef131d3a98473a git remote add gfs2 https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git git fetch --no-tags gfs2 for-next.holder_stealing2 git checkout 14d6ca0628042b7be9c06df73fef131d3a98473a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> sparse warnings: (new ones prefixed by >>) >> mm/gup.c:1753:24: sparse: sparse: incompatible types in comparison >> expression (different type sizes): >> mm/gup.c:1753:24: sparse: unsigned long * >> mm/gup.c:1753:24: sparse: unsigned int * vim +1753 mm/gup.c 1696 1697 /** 1698 * fault_in_safe_writeable - fault in an address range for writing 1699 * @uaddr: start of address range 1700 * @size: length of address range 1701 * 1702 * Faults in an address range using get_user_pages, i.e., without triggering 1703 * hardware page faults. This is primarily useful when we know that some or 1704 * all of the pages in the address range aren't in memory. 1705 * 1706 * Other than fault_in_writeable(), this function is non-destructive. 1707 * 1708 * Note that we don't pin or otherwise hold the pages referenced that we fault 1709 * in. There's no guarantee that they'll stay in memory for any duration of 1710 * time. 1711 * 1712 * Returns the number of bytes faulted in from @uaddr. 1713 */ 1714 size_t fault_in_safe_writeable(const char __user *uaddr, size_t size) 1715 { 1716 unsigned long start = (unsigned long)uaddr; 1717 unsigned long end, nstart, nend; 1718 struct mm_struct *mm = current->mm; 1719 struct vm_area_struct *vma = NULL; 1720 int locked = 0; 1721 1722 /* FIXME: Protect against overflow! */ 1723 1724 end = PAGE_ALIGN(start + size); 1725 for (nstart = start & PAGE_MASK; nstart < end; nstart = nend) { 1726 unsigned long nr_pages; 1727 long ret; 1728 1729 if (!locked) { 1730 locked = 1; 1731 mmap_read_lock(mm); 1732 vma = find_vma(mm, nstart); 1733 } else if (nstart >= vma->vm_end) 1734 vma = vma->vm_next; 1735 if (!vma || vma->vm_start >= end) 1736 break; 1737 nend = min(end, vma->vm_end); 1738 if (vma->vm_flags & (VM_IO | VM_PFNMAP)) 1739 continue; 1740 if (nstart < vma->vm_start) 1741 nstart = vma->vm_start; 1742 nr_pages = (nend - nstart) / PAGE_SIZE; 1743 ret = __get_user_pages_locked(mm, nstart, nr_pages, 1744 NULL, NULL, &locked, 1745 FOLL_TOUCH | FOLL_WRITE); 1746 if (ret <= 0) 1747 break; 1748 nend = nstart + ret * PAGE_SIZE; 1749 } 1750 if (locked) 1751 mmap_read_unlock(mm); 1752 if (nstart > start) > 1753 return min(nstart - start, size); 1754 return 0; 1755 } 1756 EXPORT_SYMBOL(fault_in_safe_writeable); 1757 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
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