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

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On 10/25/11 14:35, Keir Fraser 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.
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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