mm/mmap: add inline vma_next() for readability of mmap code

	return 0;

}

/*

 * vma_next() - Get the next VMA.

 * @mm: The mm_struct.

 * @vma: The current vma.

 *

 * If @vma is NULL, return the first vma in the mm.

 *

 * Returns: The next VMA after @vma.

 */

static inline struct vm_area_struct *vma_next(struct mm_struct *mm,

					 struct vm_area_struct *vma)

{

	if (!vma)

		return mm->mmap;

	return vma->vm_next;

}

static unsigned long count_vma_pages_range(struct mm_struct *mm,

		unsigned long addr, unsigned long end)

{

	if (vm_flags & VM_SPECIAL)

		return NULL;

	if (prev)

		next = prev->vm_next;

	else

		next = mm->mmap;

	next = vma_next(mm, prev);

	area = next;

	if (area && area->vm_end == end)		/* cases 6, 7, 8 */

		next = next->vm_next;

		struct vm_area_struct *vma, struct vm_area_struct *prev,

		unsigned long start, unsigned long end)

{

	struct vm_area_struct *next = prev ? prev->vm_next : mm->mmap;

	struct vm_area_struct *next = vma_next(mm, prev);

	struct mmu_gather tlb;

	lru_add_drain();

		if (error)

			return error;

	}

	vma = prev ? prev->vm_next : mm->mmap;

	vma = vma_next(mm, prev);

	if (unlikely(uf)) {

		/*