591 		unsigned long old_addr, unsigned long old_len,  in move_vma()  argument
596 	long to_account = new_len - old_len;  in move_vma()
622 		if (!err && vma->vm_end != old_addr + old_len)  in move_vma()
623 			err = vma->vm_ops->may_split(vma, old_addr + old_len);  in move_vma()
635 	err = ksm_madvise(vma, old_addr, old_addr + old_len,  in move_vma()
655 	moved_len = move_page_tables(vma, old_addr, new_vma, new_addr, old_len,  in move_vma()
657 	if (moved_len < old_len) {  in move_vma()
672 		old_len = new_len;  in move_vma()
688 		if (vma->vm_end > old_addr + old_len)  in move_vma()
717 			vma->vm_end == (old_addr + old_len))  in move_vma()
725 	if (do_vmi_munmap(&vmi, mm, old_addr, old_len, uf_unmap, false) < 0) {  in move_vma()
728 			vm_acct_memory(old_len >> PAGE_SHIFT);  in move_vma()
754 	unsigned long old_len, unsigned long new_len, unsigned long flags)  in vma_to_resize()  argument
772 	if (!old_len && !(vma->vm_flags & (VM_SHARED | VM_MAYSHARE))) {  in vma_to_resize()
782 	if (old_len > vma->vm_end - addr)  in vma_to_resize()
785 	if (new_len == old_len)  in vma_to_resize()
797 	if (!mlock_future_ok(mm, vma->vm_flags, new_len - old_len))  in vma_to_resize()
801 				(new_len - old_len) >> PAGE_SHIFT))  in vma_to_resize()
807 static unsigned long mremap_to(unsigned long addr, unsigned long old_len,  in mremap_to()  argument
825 	if (addr + old_len > new_addr && new_addr + new_len > addr)  in mremap_to()
851 	if (old_len > new_len) {  in mremap_to()
852 		ret = do_munmap(mm, addr+new_len, old_len - new_len, uf_unmap);  in mremap_to()
855 		old_len = new_len;  in mremap_to()
858 	vma = vma_to_resize(addr, old_len, new_len, flags);  in mremap_to()
866 		!may_expand_vm(mm, vma->vm_flags, old_len >> PAGE_SHIFT)) {  in mremap_to()
887 	ret = move_vma(vma, addr, old_len, new_len, new_addr, locked, flags, uf,  in mremap_to()
915 SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,  in SYSCALL_DEFINE5()  argument
951 			(!(flags & MREMAP_MAYMOVE) || old_len != new_len))  in SYSCALL_DEFINE5()
958 	old_len = PAGE_ALIGN(old_len);  in SYSCALL_DEFINE5()
980 		old_len = ALIGN(old_len, huge_page_size(h));  in SYSCALL_DEFINE5()
993 		if (new_len > old_len)  in SYSCALL_DEFINE5()
998 		ret = mremap_to(addr, old_len, new_addr, new_len,  in SYSCALL_DEFINE5()
1010 	if (old_len >= new_len) {  in SYSCALL_DEFINE5()
1013 		if (old_len == new_len) {  in SYSCALL_DEFINE5()
1018 		ret = do_vmi_munmap(&vmi, mm, addr + new_len, old_len - new_len,  in SYSCALL_DEFINE5()
1030 	vma = vma_to_resize(addr, old_len, new_len, flags);  in SYSCALL_DEFINE5()
1038 	if (old_len == vma->vm_end - addr) {  in SYSCALL_DEFINE5()
1040 		if (vma_expandable(vma, new_len - old_len)) {  in SYSCALL_DEFINE5()
1041 			long pages = (new_len - old_len) >> PAGE_SHIFT;  in SYSCALL_DEFINE5()
1042 			unsigned long extension_start = addr + old_len;  in SYSCALL_DEFINE5()
1103 		ret = move_vma(vma, addr, old_len, new_len, new_addr,  in SYSCALL_DEFINE5()
1110 	if (locked && new_len > old_len)  in SYSCALL_DEFINE5()
1111 		mm_populate(new_addr + old_len, new_len - old_len);  in SYSCALL_DEFINE5()
1114 	mremap_userfaultfd_complete(&uf, addr, ret, old_len);  in SYSCALL_DEFINE5()