[next:master 183/372] mm/gup.c:531:53: sparse: implicit cast to nocast type

[next:master 183/372] mm/gup.c:531:53: sparse: implicit cast to nocast type

[kbuild test robot]

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   7df9f89cbcffc4f7bd8feea287af7b8d32b9ed96
commit: b28f3d3d605378f4d5b4b037033ebfeee74be1c2 [183/372] mm: move get_user_pages()-related code to separate file
reproduce: make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> mm/gup.c:531:53: sparse: implicit cast to nocast type

vim +531 mm/gup.c

   515	 * such architectures, gup() will not be enough to make a subsequent access
   516	 * succeed.
   517	 *
   518	 * This should be called with the mm_sem held for read.
   519	 */
   520	int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
   521			     unsigned long address, unsigned int fault_flags)
   522	{
   523		struct vm_area_struct *vma;
   524		vm_flags_t vm_flags;
   525		int ret;
   526	
   527		vma = find_extend_vma(mm, address);
   528		if (!vma || address < vma->vm_start)
   529			return -EFAULT;
   530	
 > 531		vm_flags = (fault_flags & FAULT_FLAG_WRITE) ? VM_WRITE : VM_READ;
   532		if (!(vm_flags & vma->vm_flags))
   533			return -EFAULT;
   534	
   535		ret = handle_mm_fault(mm, vma, address, fault_flags);
   536		if (ret & VM_FAULT_ERROR) {
   537			if (ret & VM_FAULT_OOM)
   538				return -ENOMEM;
   539			if (ret & (VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE))

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