linux-kernel - [PATCH 0/2] cpumask fallout: Initialize irq_default

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Message-ID: <496683D0.6000509@caviumnetworks.com>
Date:	Thu, 08 Jan 2009 14:53:04 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mike Travis <travis@....com>,
	linux-mips <linux-mips@...ux-mips.org>
Subject: [PATCH 0/2] cpumask fallout: Initialize irq_default_affinity earlier
 et al.

As I said in 2/2:

    Move the initialization of irq_default_affinity to early_irq_init
    as core_initcall is too late.

    irq_default_affinity can be used in init_IRQ and potentially timer
    and SMP init as well.  All of these happen before core_initcall.
    Moving the initialization to early_irq_init ensures that it is
    initialized before it is used.

Mike Travis pointed out that irq_default_affinity depends on
CONFIG_GENERIC_HARDIRQS in addition to CONFIG_SMP.  So to make things
consistent, I added 1/2 so that the irq_*_affinity functions and
irq_default_affinity are defined for the same conditions that they are
declared.

I Took Linus' suggestion to move init_irq_default_affinity over to
kernel/irq/handle.c, however due to the way that cpumask_*() are
defined, it is still necessary to have the ugly ifdefs, but now they
are localized to init_irq_default_affinity.

Mike Travis also suggested that alloc_bootmem_cpumask_var() be used in
preference to alloc_cpumask_var, so I incorporated that suggestion as
well.

I tested both with and without CONFIG_SMP, on mips/cavium_octeon, Mike
tested a similar(but not identical patch) on x86_64.

I will reply with the two patches.

David Daney (2):
  Make irq_*_affinity depend on CONFIG_GENERIC_HARDIRQS too.
  cpumask fallout: Initialize irq_default_affinity earlier (v2).

 kernel/irq/handle.c |   12 ++++++++++++
 kernel/irq/manage.c |   10 +---------
 2 files changed, 13 insertions(+), 9 deletions(-)

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