[PATCH v3 0/4] kdb: Improve console handling

[Sumit Garg]

This patch-set is aimed to improve console handling especially when kdb
operates in NMI context.

Brief description of enhancements:
- Add status check for console prior to invoking corresponding handler.
- Fixup to avoid possible deadlock in NMI context due to usage of locks
  in the console handlers.
- Prefer usage of polling I/O driver mode (lockless APIs) over invocation
  of console handlers.

Changes in v3:
- Split patch to have separate patch for console status check.
- New patch to re-factor kdb message emit code.
- New patch to prefer polling I/O over console mode.
- Add code comments to describe usage of oops_in_progress.

Changes in v2:
- Use oops_in_progress directly instead of bust_spinlocks().

Sumit Garg (4):
  kdb: Re-factor kdb_printf() message write code
  kdb: Check status of console prior to invoking handlers
  kdb: Make kdb_printf robust to run in NMI context
  kdb: Switch kdb_msg_write() to use safer polling I/O

 drivers/tty/serial/kgdboc.c | 17 ++++-----
 include/linux/kgdb.h        |  2 +
 kernel/debug/kdb/kdb_io.c   | 91 ++++++++++++++++++++++++++++++---------------
 3 files changed, 72 insertions(+), 38 deletions(-)

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2.7.4