linux-kernel - Re: TARGET_CPUS in assign_irq

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Date:	Tue, 9 Sep 2008 15:54:16 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: TARGET_CPUS in assign_irq_vector

On Tue, Sep 9, 2008 at 3:30 PM, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> On x86-64, the genapic implementations of target_cpus returns
> cpu_online_map.  What if more cpus have yet to come online?  Shouldn't
> it be cpu_possible_map?
>
> Though I'm probably confused.  I don't really know what the intent of
> target_cpus and vector_allocation_domain is.
>
logical mode, vector_allocation_domain will return all online cpus aka
the 8 cpus.

phys_flat mode, vector_allotcation_domain will only the cpumask with
the cpu set..

target_cpus is the cpus that could be possible to used to take vector
and process that irq. so at least it should be online.

YH
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