779 	unsigned long faddr, prev_faddr, left, right;  in swap_vma_ra_win()  local
786 	faddr = vmf->address;  in swap_vma_ra_win()
791 	win = __swapin_nr_pages(PFN_DOWN(prev_faddr), PFN_DOWN(faddr), hits,  in swap_vma_ra_win()
793 	atomic_long_set(&vma->swap_readahead_info, SWAP_RA_VAL(faddr, win, 0));  in swap_vma_ra_win()
797 	if (faddr == prev_faddr + PAGE_SIZE)  in swap_vma_ra_win()
798 		left = faddr;  in swap_vma_ra_win()
799 	else if (prev_faddr == faddr + PAGE_SIZE)  in swap_vma_ra_win()
800 		left = faddr - (win << PAGE_SHIFT) + PAGE_SIZE;  in swap_vma_ra_win()
802 		left = faddr - (((win - 1) / 2) << PAGE_SHIFT);  in swap_vma_ra_win()
806 	*start = max3(left, vma->vm_start, faddr & PMD_MASK);  in swap_vma_ra_win()
807 	*end = min3(right, vma->vm_end, (faddr & PMD_MASK) + PMD_SIZE);  in swap_vma_ra_win()