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 v5: - Rebased on top of tags/kgdb-5.8-rc1. - Get rid of kdb_io_write(). - Fixed issue reported by kbuild test robot. - Remove is_console from kgdboc_earlycon_io_ops as well. - Misc. comments. - Added Doug's review tag. 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 | 6 ++-- drivers/usb/early/ehci-dbgp.c | 3 +- include/linux/kgdb.h | 5 ++- kernel/debug/kdb/kdb_io.c | 72 ++++++++++++++++++++++++++----------------- 5 files changed, 51 insertions(+), 37 deletions(-) -- 2.7.4 _______________________________________________ Kgdb-bugreport mailing list Kgdb-bugreport@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
