Merge tag 'kgdb-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt...

Pull kgdb updates from Daniel Thompson:
 "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"

* tag 'kgdb-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux:
  kdb: Tweak escape handling for vi users
  kdb: Improve handling of characters from different input sources
  kdb: Remove special case logic from kdb_read()
  kdb: Simplify code to fetch characters from console
  kdb: Tidy up code to handle escape sequences
  kdb: Avoid array subscript warnings on non-SMP builds
  kdb: Fix stack crawling on 'running' CPUs that aren't the master
  kdb: Fix "btc <cpu>" crash if the CPU didn't round up
  kdb: Remove unused "argcount" param from kdb_bt1(); make btaprompt bool
  kgdb: Remove unused DCPU_SSTEP definition