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



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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