Re: [Xen-devel] xen kernel: build failure

[Jean Guyader <jean.guyader@xxxxxxxxx>]

On 25 October 2011 13:35, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
> On 25/10/2011 12:08, "Christoph Egger" <Christoph.Egger@xxxxxxx> 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.
>
> 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.
>

Is there a reason for that? What would be the recommended to add something
into the struct domain now if we can't make it bigger than a page.

Jean

>  -- Keir
>
>>
>> Christoph
>>
>
>
>
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