linux-kernel - [PATCH v2 0/3] Add IRQ chip hooks for taking CPUs on/off line.

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Date:	Thu, 24 Mar 2011 18:06:35 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	tglx@...utronix.de, linux-mips@...ux-mips.org
Cc:	linux-kernel@...r.kernel.org,
	David Daney <ddaney@...iumnetworks.com>
Subject: [PATCH v2 0/3] Add IRQ chip hooks for taking CPUs on/off line.

When a CPU is brought on-line, per-CPU interrupts need to be enabled
on the new CPU.  The local timer and things like perf counters that
rely on interrupts don't work if their interrupts are not enabled.

Likewise when a CPU is taken off-line, we may need to clean up the
interrupts.

I solve both of these problems by adding a pair of function pointers
to the irq_chip structure, along with some simple helper functions to
call them.

There are a pair of helper functions, irq_cpu_{on,off}line(), iterate
through all irqs calling the chip.irq_cpu_{on,off}line() for each irq.

My chip.irq_cpu_offline() need to adjust the affinity of some irqs, so
I split up irq_set_affinity() in to two parts, one of which I can call
with the irq desc lock held.

Finally I completely rewrite my irq handling code which uses the
changes to the core irq code.

David Daney (3):
  genirq: Add chip hooks for taking CPUs on/off line.
  genirq: Split irq_set_affinity() so it can be called with lock held.
  MIPS: Octeon: Rewrite interrupt handling code.

 arch/mips/cavium-octeon/octeon-irq.c           | 1423 ++++++++++++++----------
 arch/mips/cavium-octeon/setup.c                |   12 -
 arch/mips/cavium-octeon/smp.c                  |   39 +-
 arch/mips/include/asm/mach-cavium-octeon/irq.h |  243 ++---
 arch/mips/include/asm/octeon/octeon.h          |    2 +
 arch/mips/pci/msi-octeon.c                     |   20 +-
 include/linux/interrupt.h                      |    2 +
 include/linux/irq.h                            |    8 +
 kernel/irq/chip.c                              |   62 +
 kernel/irq/manage.c                            |   40 +-
 10 files changed, 1020 insertions(+), 831 deletions(-)

-- 
1.7.2.3

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