zram: use copy_page for full page copy

Some architectures, such as arm, have implemented optimized copy_page for
full page copying.

Replace the full page memcpy with copy_page to take advantage of the
optimization.

Link: https://lkml.kernel.org/r/20231007070554.8657-1-mark-pk.tsai@mediatek.comSigned-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: YJ Chiang <yj.chiang@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

drivers/block/zram/zram_drv.c

@@ -1337,7 +1337,7 @@ static int zram_read_from_zspool(struct zram *zram, struct page *page,
 	src = zs_map_object(zram->mem_pool, handle, ZS_MM_RO);
 	if (size == PAGE_SIZE) {
 		dst = kmap_local_page(page);
-		memcpy(dst, src, PAGE_SIZE);
+		copy_page(dst, src);
 		kunmap_local(dst);
 		ret = 0;
 	} else {