VFF_RING_SIZE     171 drivers/dma/mediatek/mtk-uart-apdma.c 	if ((wpt & VFF_RING_SIZE) == vff_sz)
VFF_RING_SIZE     237 drivers/dma/mediatek/mtk-uart-apdma.c 	cnt = (wg & VFF_RING_SIZE) - (rg & VFF_RING_SIZE);