Extern or forward variable declaration at include/media/v4l2-async.h, line 14 References: drivers/media/i2c/adv7511-v4l2.c, line 576 drivers/media/i2c/ap1302.c, line 401 drivers/media/i2c/ap1302.c, line 415 drivers/media/i2c/ap1302.c, line 2265 drivers/media/platform/xilinx/xilinx-dma.c, line 322 drivers/media/platform/xilinx/xilinx-dma.c, line 1434 drivers/media/platform/xilinx/xilinx-dprxss.c, line 220 drivers/media/platform/xilinx/xilinx-dprxss.c, line 1187 drivers/media/platform/xilinx/xilinx-dprxss.c, line 1200 drivers/media/platform/xilinx/xilinx-dprxss.c, line 1285 drivers/media/platform/xilinx/xilinx-hdmirxss.c, line 350 drivers/media/platform/xilinx/xilinx-hdmirxss.c, line 3026 drivers/media/platform/xilinx/xilinx-sdirxss.c, line 314 drivers/media/platform/xilinx/xilinx-vipp.h, line 37 drivers/media/platform/xilinx/xilinx-vpss-csc.c, line 251 drivers/media/platform/xilinx/xilinx-vpss-csc.c, line 994 drivers/media/test-drivers/vivid/vivid-vid-cap.c, line 84 samples/v4l/v4l2-pci-skeleton.c, line 167