Hello Andrew, Russell,
The KDB/NMI core support has been merged into v3.7-rc1, so the only ARM bits are pending now.
I addressed all the comments ~two month ago, and since then just resending these patches. I know we're all busy, so no blaming. :) But then let's pass this via -mm?
Short description of the KDB/FIQ debugger:
The FIQ debugger is a facility that can be used to debug situations when the kernel stuck in uninterruptable sections, e.g. the kernel infinitely loops or deadlocked in an interrupt or with interrupts disabled. On some development boards there is even a special NMI button, which is very useful for debugging weird kernel hangs.
And FIQ is basically an NMI, it has a higher priority than IRQs, and upon IRQ exception FIQs are not disabled. It is still possible to disable FIQs (as well as some "NMIs" on other architectures), but via special means.
Old changelogs and a full rationale for these patches can be found here:
v1-v5, rationale: http://lkml.org/lkml/2012/9/10/2 v6: http://lkml.org/lkml/2012/9/10/2 v7: http://lkml.org/lkml/2012/9/13/367 v8: http://lkml.org/lkml/2012/9/19/525 v9: http://lkml.org/lkml/2012/9/24/538
Thanks! Anton.
-- arch/arm/Kconfig | 19 ++++ arch/arm/common/vic.c | 28 +++++ arch/arm/include/asm/hardware/vic.h | 2 + arch/arm/include/asm/kgdb.h | 8 ++ arch/arm/kernel/Makefile | 1 + arch/arm/kernel/entry-armv.S | 167 +-------------------------- arch/arm/kernel/entry-header.S | 170 ++++++++++++++++++++++++++++ arch/arm/kernel/kgdb_fiq.c | 124 ++++++++++++++++++++ arch/arm/kernel/kgdb_fiq_entry.S | 87 ++++++++++++++ arch/arm/mach-versatile/Makefile | 1 + arch/arm/mach-versatile/kgdb_fiq.c | 31 +++++ 11 files changed, 472 insertions(+), 166 deletions(-)