From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Egger <Christoph.Egger@amd.com>
Subject: Re: xen kernel: build failure
Date: Tue, 25 Oct 2011 17:22:45 +0200
Message-ID: <4EA6D445.8030209@amd.com>
References: <CACC6B9F.23926%keir.xen@gmail.com>
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To: Keir Fraser <keir.xen@gmail.com>
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On 10/25/11 14:35, Keir Fraser wrote:
> On 25/10/2011 12:08, "Christoph Egger"<Christoph.Egger@amd.com>  wrote:
>
>>
>> Hi,
>>
>> Compiling the xen kernel fails with:
>>
>> xen/arch/x86/domain.c: In function 'alloc_domain_struct'
>> xen/arch/x86/domain.c:191: error: negative width in bit-field '<anonymous>'
>
> Problem is that struct domain has grown bigger than a page for some reason,
> in your build environment.

Oh, local changes caused this. Thanks for the hint.

Christoph


>
> I can't reproduce this.
>
>> Removing the line
>>
>> BUILD_BUG_ON(sizeof(*d)>  PAGE_SIZE);
>>
>> makes xen kernel compile again.
>
> But not actually work properly. We only allocate a single page for the
> domain struct. If the struct is bigger than a page, you'll get memory
> corruption at run time.
>
>   -- Keir
>
>>
>> Christoph
>>
>
>
>


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