linux-kernel - [gfs2:for-next.mmap-fault 5/12] mm/gup.c:1714:8: error: conflicting types for 'fault_in_safe

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Message-ID: <202108031741.MwPfHrtv-lkp@intel.com>
Date:   Tue, 3 Aug 2021 17:58:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andreas Gruenbacher <agruenba@...hat.com>
Cc:     kbuild-all@...ts.01.org, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [gfs2:for-next.mmap-fault 5/12] mm/gup.c:1714:8: error: conflicting
 types for 'fault_in_safe_writeable'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next.mmap-fault
head:   bfd94d74183df4cc99a705b96f2be61a865e5564
commit: f276043444d9cb56239f8525b48febe88dfb0e25 [5/12] iov_iter: Introduce fault_in_iov_iter_writeable
config: xtensa-randconfig-s032-20210803 (attached as .config)
compiler: xtensa-linux-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=f276043444d9cb56239f8525b48febe88dfb0e25
        git remote add gfs2 https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git
        git fetch --no-tags gfs2 for-next.mmap-fault
        git checkout f276043444d9cb56239f8525b48febe88dfb0e25
        # 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=xtensa SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> mm/gup.c:1714:8: error: conflicting types for 'fault_in_safe_writeable'
    1714 | size_t fault_in_safe_writeable(const char __user *uaddr, unsigned long len)
         |        ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from mm/gup.c:9:
   include/linux/pagemap.h:740:8: note: previous declaration of 'fault_in_safe_writeable' was here
     740 | size_t fault_in_safe_writeable(const char __user *uaddr, size_t size);
         |        ^~~~~~~~~~~~~~~~~~~~~~~


vim +/fault_in_safe_writeable +1714 mm/gup.c

  1696	
  1697	/**
  1698	 * fault_in_safe_writeable - fault in an address range for writing
  1699	 * @uaddr: start of address range
  1700	 * @len: 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, unsigned long len)
  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 + len);
  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, len);
  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/kbuild-all@lists.01.org

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