Extern or forward variable declaration arch/um/include/shared/chan_user.h, line 43 [usage...] include/linux/console.h, line 23 [usage...] include/linux/selection.h, line 13 [usage...] include/linux/selection.h, line 16 [usage...] include/linux/sysrq.h, line 20 [usage...] include/linux/tty_driver.h, line 233 [usage...] include/linux/vt_kern.h, line 55 [usage...] Structure include/linux/tty.h, line 253 [usage...] Local variable drivers/char/tty_io.c, line 923 [usage...]