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    Subject[PATCH v4 0/4] kdb: Improve console handling
    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 v4:
    - Use dbg_io_ops->write_char() directly instead of passing it as a
    function pointer.
    - Use "struct console" rather than "struct tty_driver" for comparison.
    - Make commit descriptions and comments more informative.
    - Add review tag for patch #2.

    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() console handling more robust
    kdb: Switch to use safer dbg_io_ops over console APIs

    drivers/tty/serial/kgdb_nmi.c | 2 +-
    drivers/tty/serial/kgdboc.c | 4 +--
    drivers/usb/early/ehci-dbgp.c | 3 +-
    include/linux/kgdb.h | 5 ++-
    kernel/debug/kdb/kdb_io.c | 76 ++++++++++++++++++++++++++-----------------
    5 files changed, 54 insertions(+), 36 deletions(-)


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