Re: [Xen-devel] 2.6.32 pv_ops and sparse/flat memory

[Daniel Kiper <dkiper@xxxxxxxxxxxx>]

Hello,

On Mon, Nov 22, 2010 at 01:22:30PM +0300, Vasiliy G Tolstov wrote:
> On Mon, 2010-11-22 at 11:09 +0100, Daniel Kiper wrote:
> > Hello,
> >
> > On Fri, Nov 19, 2010 at 04:44:17PM +0300, Vasiliy G Tolstov wrote:
> > > Hello. I'm try to compile 32 bit pae kernel from xen git repo. If i
> > > check sparse memory - i get error
> >
> > Please send me full address of Xen repository which you are using
> > its head
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen
> git checkout -b xen/stable-2.6.32.x origin/xen/stable-2.6.32.x
>
> > and contents of your config file.
> in attach, modify flat memory to sparse mem and compile under i686 arch

As I find out it is normal behavior when CONFIG_XEN is enabled in this
kernel version. Unlike mainline kernel this version establish new PG_foreign
page flag which with CONFIG_SPARSEMEM_MANUAL and CONFIG_HIGHMEM64G
enabled overflow page flags field which is - surprise - 32-bit long in
i386 (for more details read include/linux/page-flags.h file).

Solution:
  - enable CONFIG_HIGHMEM4G,
  - disable CONFIG_XEN (I am not sure that it
    is good one for you :-))) ).

Daniel

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