PTR_CHANNELNUM_MASK 28 sound/pci/emu10k1/io.c regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK); PTR_CHANNELNUM_MASK 63 sound/pci/emu10k1/io.c regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK);