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

To:	Christoph Egger <Christoph.Egger@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] xen kernel: build failure
From:	Keir Fraser <keir.xen@xxxxxxxxx>
Date:	Tue, 25 Oct 2011 13:35:27 +0100
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Thread-topic:	[Xen-devel] xen kernel: build failure
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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.

 -- Keir

> 
> Christoph
> 

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