linux-kernel - Re: [PATCH v2] kvm: fix irqfd build failure discovered in linux-next

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Date:	Thu, 21 May 2009 10:04:24 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Avi Kivity <avi@...hat.com>
CC:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	sfr@...b.auug.org.au, kvm@...r.kernel.org
Subject: Re: [PATCH v2] kvm: fix irqfd build failure discovered in linux-next

Avi Kivity wrote:
> Gregory Haskins wrote:
>> Stephen Rothwell noted a build failure in arch != x86 in last nights
>> linux-next tree, as noted here:
>>
>> http://lkml.org/lkml/2009/5/21/32
>>
>> This patch corrects the build issue by requiring explicit support for
>> IRQFD to be defined, and only defining it on x86 (the only arch fully
>> supported).  The code itself isnt architecture dependent, but we need
>> to add a new file to each makefile, advertise the capability, and
>> of course, test that it works for each supported arch.  We will submit
>> patches against each relevant arch at a later time to enable support
>> there as well.
>>
>>  
>> +config HAVE_KVM_EVENTFD
>> +       bool
>> +       default y
>> +
>>   
>
> The build system will complain if it sees a symbol used but not
> defined; so you have to define it for all four archs.  So I went ahead
> and did virt/kvm/Kconfig and adapted your patch to use it.
>
>

Cool, thanks!

-Greg


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