linux-kernel - Re: [KVM PATCH v3 3/3] KVM: Fix races in irqfd using new eventfd_kref

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Message-ID: <4A40ECFF.7060706@gmail.com>
Date:	Tue, 23 Jun 2009 10:55:59 -0400
From:	Gregory Haskins <gregory.haskins@...il.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Gregory Haskins <ghaskins@...ell.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, avi@...hat.com,
	paulmck@...ux.vnet.ibm.com, davidel@...ilserver.org, mingo@...e.hu,
	rusty@...tcorp.com.au
Subject: Re: [KVM PATCH v3 3/3] KVM: Fix races in irqfd using new eventfd_kref_get
 interface

Gregory Haskins wrote:
> Michael S. Tsirkin wrote:
>   
>
>>  And note that multiple works can run on irqfd
>> in parallel.
>>   
>>     
>
> They can?  I thought work-queue items were guaranteed to only schedule
> once?  If what you say is true, its broken, I agree, and Ill need to
> revisit.  Let me get back to you.
>   

<sigh> Yep, you are right.  This is broken in my code. :(

Will address in the next spin.  Good catch.

-Greg




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