linux-kernel - Re: [PATCH 2/2] x86_64 irq: Only look at per

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Date:	Sun, 22 Oct 2006 23:17:23 -0700
From:	yhlu <yhlu.kernel@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Andi Kleen" <ak@...e.de>, "Muli Ben-Yehuda" <muli@...ibm.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>
Subject: Re: [PATCH 2/2] x86_64 irq: Only look at per_cpu data for online cpus.

On 10/22/06, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> When I generalized __assign_irq_vector I failed to pay attention
> to what happens when you access a per cpu data structure for
> a cpu that is not online.   It is an undefined case making any
> code that does it have undefined behavior as well.
>
> The code still needs to be able to allocate a vector across cpus
> that are not online to properly handle combinations like lowest
> priority interrupt delivery and cpu_hotplug.  Not that we can do
> that today but the infrastructure shouldn't prevent it.
>
> So this patch updates the places where we touch per cpu data
> to only touch online cpus, it makes cpu vector allocation
> an atomic operation with respect to cpu hotplug, and it updates
> the cpu start code to properly initialize vector_irq so we
> don't have inconsistencies.
>
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>

Acked-by: Yinghai Lu <yinghai.lu@....com>
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