uprobes: Change __copy_insn() to use copy_from_page()

			unsigned long nbytes, loff_t offset)

{

	struct page *page;

	void *vaddr;

	unsigned long off;

	pgoff_t idx;

	if (!filp)

		return -EINVAL;

	if (!mapping->a_ops->readpage)

		return -EIO;

	idx = offset >> PAGE_CACHE_SHIFT;

	off = offset & ~PAGE_MASK;

	/*

	 * Ensure that the page that has the original instruction is

	 * populated and in page-cache.

	 */

	page = read_mapping_page(mapping, idx, filp);

	page = read_mapping_page(mapping, offset >> PAGE_CACHE_SHIFT, filp);

	if (IS_ERR(page))

		return PTR_ERR(page);

	vaddr = kmap_atomic(page);

	memcpy(insn, vaddr + off, nbytes);

	kunmap_atomic(vaddr);

	copy_from_page(page, offset, insn, nbytes);

	page_cache_release(page);

	return 0;