[GIT PULL] kgdb changes v5.5-rc1

[Daniel Thompson]

The following changes since commit da0c9ea146cbe92b832f1b0f694840ea8eb33cce:

  Linux 5.4-rc2 (2019-10-06 14:27:30 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux.git/ tags/kgdb-5.5-rc1

for you to fetch changes up to c58ff643763c78bef12874ee39995c9f7f987bc2:

  kdb: Tweak escape handling for vi users (2019-10-28 12:08:29 +0000)

----------------------------------------------------------------
kgdb patches for 5.5-rc1

The major change here is the work from Douglas Anderson that
reworks the way kdb stack traces are handled on SMP systems.
The effect is to allow all CPUs to issue their stack trace which
reduced the need for architecture specific code to support stack
tracing.

Also included are general of clean ups from Doug and myself:

 * Remove some unused variables or arguments.
 * Tidy up the kdb escape handling code and fix a couple of odd
   corner cases.
 - Better ignore escape characters that do not form part of an
   escape sequence. This mostly benefits vi users since they are most
   likely to press escape as a nervous habit but it won't harm anyone
   else.

Signed-off-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx>

----------------------------------------------------------------
Daniel Thompson (6):
      kdb: Avoid array subscript warnings on non-SMP builds
      kdb: Tidy up code to handle escape sequences
      kdb: Simplify code to fetch characters from console
      kdb: Remove special case logic from kdb_read()
      kdb: Improve handling of characters from different input sources
      kdb: Tweak escape handling for vi users

Douglas Anderson (4):
      kgdb: Remove unused DCPU_SSTEP definition
      kdb: Remove unused "argcount" param from kdb_bt1(); make btaprompt bool
      kdb: Fix "btc <cpu>" crash if the CPU didn't round up
      kdb: Fix stack crawling on 'running' CPUs that aren't the master

 kernel/debug/debug_core.c      |  34 ++++++
 kernel/debug/debug_core.h      |   3 +-
 kernel/debug/kdb/kdb_bt.c      | 116 +++++++++++----------
 kernel/debug/kdb/kdb_io.c      | 231 ++++++++++++++++++++---------------------
 kernel/debug/kdb/kdb_private.h |   1 +
 5 files changed, 208 insertions(+), 177 deletions(-)