Messages in this thread | | | From | Sumit Garg <> | Subject | [PATCH v3 0/4] kdb: Improve console handling | Date | Wed, 27 May 2020 11:55:55 +0530 |
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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(-)
-- 2.7.4
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