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Subject[PATCH v3 0/5] arm: Implement arch_trigger_all_cpu_backtrace
This patchset implements arch_trigger_all_cpu_backtrace for arm.

Non-maskable signalling relies on the kernel being able to access FIQ
and therefore, for devices that implement TrustZone, it will work only on
systems that boot the kernel in secure mode.

Tested on Freescale iMX.6 (both via SysRq-l and by deliberately locking
up the kernel with CONFIG_DEBUG_SPINLOCK=y).

Changes since v2:

* Removed redundant header guards from arch/arm64/include/asm/fiq.h
(review of Catalin Marinas).

* Moved svc_exit_via_fiq macro to entry-header.S (review of Nicolas

Changes since v1:

* Restructured to sit nicely on a similar FYI patchset from Russell
King. It now effectively replaces the work in progress final patch
with something much more complete.

* Implemented (and tested) a Thumb-2 implementation of svc_exit_via_fiq
(review of Nicolas Pitre)

* Dropped the GIC group 0 workaround patch. The issue of FIQ interrupts
being acknowledged by the IRQ handler does still exist but should be
harmless because the IRQ handler will still wind up calling

* Removed any dependency on CONFIG_FIQ; all cpu backtrace effectively
becomes a platform feature (although the use of non-maskable
interrupts to implement it is best effort rather than guaranteed).

* Better comments highlighting usage of RAZ/WI registers (and parts of
registers) in the GIC code.

Changes *before* v1:

* This patchset is a hugely cut-down successor to "[PATCH v11 00/19]
arm: KGDB NMI/FIQ support". Thanks to Thomas Gleixner for suggesting
the new structure. For historic details see:

* Fix bug in __fiq_abt (no longer passes a bad struct pt_regs value).
In fixing this we also remove the useless indirection previously
found in the fiq_handler macro.

* Make default fiq handler "always on" by migrating from fiq.c to
traps.c and replace do_unexp_fiq with the new handler (review
of Russell King).

* Add arm64 version of fiq.h (review of Russell King)

* Removed conditional branching and code from irq-gic.c, this is
replaced by much simpler code that relies on the GIC specification's
heavy use of read-as-zero/write-ignored (review of Russell King)

Daniel Thompson (3):
arm: fiq: Replace default FIQ handler
arm64: Introduce dummy version of asm/fiq.h
irqchip: gic: Add support for IPI FIQ

Russell King (2):
ARM: remove unused do_unexp_fiq() function
ARM: add basic support for on-demand backtrace of other CPUs

arch/arm/include/asm/irq.h | 5 ++
arch/arm/include/asm/smp.h | 3 +
arch/arm/kernel/entry-armv.S | 95 ++++++++++++++++++++---
arch/arm/kernel/entry-header.S | 47 ++++++++++++
arch/arm/kernel/setup.c | 8 +-
arch/arm/kernel/smp.c | 64 ++++++++++++++++
arch/arm/kernel/traps.c | 32 +++++++-
arch/arm64/include/asm/fiq.h | 8 ++
drivers/irqchip/irq-gic.c | 165 +++++++++++++++++++++++++++++++++++++---
include/linux/irqchip/arm-gic.h | 3 +
10 files changed, 407 insertions(+), 23 deletions(-)
create mode 100644 arch/arm64/include/asm/fiq.h


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