Extern or forward variable declaration include/linux/perf_event.h, line 313 [usage...] include/linux/ring_buffer.h, line 9 [usage...] Structure drivers/tty/serial/ioc3_serial.c, line 289 [usage...] drivers/tty/serial/ioc4_serial.c, line 621 [usage...] kernel/events/internal.h, line 11 [usage...] kernel/trace/ring_buffer.c, line 494 [usage...] Local variable drivers/hv/ring_buffer.c, line 260 [usage...] drivers/hv/ring_buffer.c, line 297 [usage...] Class, struct, or union member drivers/staging/frontier/alphatrack.c, line 143 [usage...] drivers/staging/frontier/tranzport.c, line 131 [usage...] drivers/usb/misc/ldusb.c, line 182 [usage...] include/linux/hyperv.h, line 416 [usage...]