[PATCH tty-next 0/7] n_tty cleanup + trace additions

[Peter Hurley <peter@hurleysoftware.com>]

Greg,

This patchset contains no bug fixes only misc cleanup for the
N_TTY line discipline.

Patches 1-4 cleans up code duplication remnants from 3.12's changes.
Patch 5 simplifies the snarled logic of how much data is considered
'input available'. I was getting tired of hand checking that logic
every time I touched minimum_to_wake.
Patch 6 reduces unnecessary wake ups.
Patch 7 extends the trace usage to aid in identifying and fixing
input flow-control bugs (this was used to fix the readline() bug).
I also expect to use it to reduce input processing restarts. It's
use is disabled by default and only enabled with the file-local
define N_TTY_TRACE (similar to TTY_DEBUG_HANGUP in tty_io.c).

Regards,

Peter Hurley (7):
  n_tty: Merge .receive_buf() flavors
  n_tty: Un-inline slow-path n_tty_receive_char()
  n_tty: Un-inline slow-path n_tty_receive_char_closing()
  n_tty: Refactor PARMRK doubling checks
  n_tty: Refactor input_available_p() by call site
  n_tty: Only perform wakeups for waiters
  n_tty: trace input/read flow control

 drivers/tty/n_tty.c | 159 ++++++++++++++++++++++++++++++++--------------------
 1 file changed, 97 insertions(+), 62 deletions(-)

-- 
1.8.1.2