Extern or forward variable declaration include/linux/perf_event.h, line 548 [usage...] include/linux/ring_buffer.h, line 9 [usage...] Structure drivers/tty/serial/ioc3_serial.c, line 286 [usage...] drivers/tty/serial/ioc4_serial.c, line 618 [usage...] kernel/events/internal.h, line 13 [usage...] kernel/trace/ring_buffer.c, line 493 [usage...] Local variable drivers/hv/ring_buffer.c, line 120 [usage...] drivers/uio/uio_hv_generic.c, line 132 [usage...] drivers/uio/uio_hv_generic.c, line 241 [usage...] Class, struct, or union member drivers/usb/misc/ldusb.c, line 159 [usage...] include/linux/hyperv.h, line 124 [usage...]