Extern or forward variable declaration at include/sound/core.h, line 30 References: drivers/gpu/drm/bridge/synopsys/dw-hdmi.c, line 125 drivers/soundwire/cadence_master.h, line 123 drivers/soundwire/qcom.c, line 130 drivers/soundwire/qcom.c, line 131 drivers/soundwire/stream.c, line 425 drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c, line 13 include/sound/core.h, line 30 include/sound/core.h, line 115 sound/soc/atmel/mchp-spdifrx.c, line 214 sound/soc/atmel/mchp-spdifrx.c, line 219 sound/soc/cirrus/ep93xx-ac97.c, line 98 sound/soc/codecs/cs4234.c, line 34 sound/soc/codecs/cs42l42.h, line 778 sound/soc/codecs/wm0010.c, line 116 sound/soc/codecs/wm0010.c, line 194 sound/soc/codecs/wm2200.c, line 83 sound/soc/codecs/wm5100.c, line 48 sound/soc/codecs/wm8962.c, line 62 sound/soc/codecs/wm8993.c, line 209 sound/soc/codecs/wm8994.c, line 2472 sound/soc/codecs/wm8994.c, line 2472 sound/soc/codecs/wm8994.c, line 2474 sound/soc/codecs/wm8996.c, line 63 sound/soc/codecs/wm8996.c, line 66 sound/soc/stm/stm32_spdifrx.c, line 233