On Wed, May 5, 2021 at 2:19 AM Jiri Slaby [off-list ref] wrote:

The only user of tty_ops::chars_in_buffer is tty_chars_in_buffer. And it
considers tty_ops::chars_in_buffer optional. In case it's NULL, zero is
returned. So remove all those chars_in_buffer from tty_ops which return
zero. (Zero means such driver doesn't buffer.)

Signed-off-by: Jiri Slaby <redacted>
c: Richard Henderson [off-list ref]
Cc: Ivan Kokshaysky <redacted>
Cc: Matt Turner <mattst88@gmail.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <redacted>
---
 arch/alpha/kernel/srmcons.c         |  7 -------
 arch/parisc/kernel/pdc_cons.c       |  6 ------
 arch/xtensa/platforms/iss/console.c |  7 -------
 drivers/s390/char/tty3270.c         | 12 ------------
 drivers/tty/pty.c                   | 17 -----------------
 drivers/tty/vt/vt.c                 |  6 ------
 6 files changed, 55 deletions(-)

Acked-by: Max Filippov <jcmvbkbc@gmail.com> # xtensa

-- 
Thanks.
-- Max