Extern or forward variable declaration at include/media/videobuf2-vmalloc.h, line 18 References: drivers/media/dvb-frontends/rtl2832_sdr.c, line 1451 drivers/media/platform/marvell-ccic/mcam-core.c, line 1282 drivers/media/platform/vim2m.c, line 828 drivers/media/platform/vim2m.c, line 841 drivers/media/platform/vivid/vivid-core.c, line 1004 drivers/media/platform/vivid/vivid-core.c, line 1023 drivers/media/platform/vivid/vivid-core.c, line 1042 drivers/media/platform/vivid/vivid-core.c, line 1061 drivers/media/platform/vivid/vivid-core.c, line 1079 drivers/media/usb/airspy/airspy.c, line 1023 drivers/media/usb/em28xx/em28xx-video.c, line 1084 drivers/media/usb/em28xx/em28xx-video.c, line 1098 drivers/media/usb/go7007/go7007-v4l2.c, line 1112 drivers/media/usb/hackrf/hackrf.c, line 1057 drivers/media/usb/msi2500/msi2500.c, line 1203 drivers/media/usb/pwc/pwc-if.c, line 1003 drivers/media/usb/s2255/s2255drv.c, line 1662 drivers/media/usb/stk1160/stk1160-v4l.c, line 643 drivers/media/usb/usbtv/usbtv-video.c, line 682 drivers/media/usb/uvc/uvc_queue.c, line 214 drivers/media/v4l2-core/videobuf2-vmalloc.c, line 435 drivers/media/v4l2-core/videobuf2-vmalloc.c, line 449 drivers/staging/media/parport/bw-qcam.c, line 967 drivers/usb/gadget/function/uvc_queue.c, line 138 include/media/videobuf2-vmalloc.h, line 18