On Wed, May 05, 2021 at 11:18:54AM +0200, Jiri Slaby wrote:

Noone stepped up in the past two years since it was marked as BROKEN by
commit c7084edc3f6d (tty: mark Siemens R3964 line discipline as BROKEN).
Remove the line discipline for good.

Three remarks:
* we remove also the uapi header (as noone is able to use that interface
  anyway)
* we do *not* remove the N_R3964 constant definition from tty.h, so it
  remains reserved.
* in_interrupt() check is now removed from vt's con_put_char. Noone else
  calls tty_operations::put_char from interrupt context.

Signed-off-by: Jiri Slaby <redacted>
---
 arch/powerpc/configs/ppc6xx_defconfig |    1 -
 drivers/char/Kconfig                  |   13 -
 drivers/tty/Makefile                  |    1 -
 drivers/tty/n_r3964.c                 | 1283 -------------------------
 drivers/tty/vt/vt.c                   |    2 -
 include/linux/n_r3964.h               |  175 ----
 include/uapi/linux/n_r3964.h          |   99 --
 7 files changed, 1574 deletions(-)
 delete mode 100644 drivers/tty/n_r3964.c
 delete mode 100644 include/linux/n_r3964.h
 delete mode 100644 include/uapi/linux/n_r3964.h

Oh yes, thank you!  I guess no one really cares about this anymore,
thanks for removing it.

greg k-h