Extern or forward variable declaration include/sound/cs8427.h, line 174 [usage...] include/sound/pcm.h, line 48 [usage...] include/sound/pxa2xx-lib.h, line 9 [usage...] include/sound/soc-dai.h, line 17 [usage...] sound/firewire/amdtp-stream.h, line 92 [usage...] sound/pci/ctxfi/cttimer.h, line 13 [usage...] sound/pci/ctxfi/ctvmem.h, line 39 [usage...] sound/pci/oxygen/oxygen.h, line 69 [usage...] sound/soc/codecs/sigmadsp.h, line 19 [usage...] sound/soc/intel/catpt/core.h, line 150 [usage...] sound/soc/mediatek/common/mtk-base-afe.h, line 79 [usage...] sound/soc/meson/aiu-fifo.h, line 15 [usage...] sound/soc/meson/meson-card.h, line 14 [usage...] Structure include/sound/pcm.h, line 442 [usage...]