This series of patches aims to improve the robustness of the OPAL console by simplifying and removing locks. If this code is interrupted due to a panic or xmon request, it may block the xmon IO or panic console flush because they use the opal console too.
So reducing locking and relaxing atomicity requirements is important for improving kernel debugging. Nicholas Piggin (6): powerpc/powernv: opal-kmsg use flush fallback from console code powerpc/powernv: Implement and use opal_flush_console powerpc/powernv: Remove OPALv1 support from opal console driver powerpc/powernv: move opal console flushing to udbg powerpc/powernv: implement opal_put_chars_nonatomic drivers/tty/hvc: remove unexplained "just in case" spin delay arch/powerpc/include/asm/opal.h | 2 + arch/powerpc/platforms/powernv/opal-kmsg.c | 38 +----- arch/powerpc/platforms/powernv/opal.c | 141 ++++++++++++++------- drivers/tty/hvc/hvc_opal.c | 17 ++- 4 files changed, 106 insertions(+), 92 deletions(-) -- 2.17.0
