Re: [PATCH] i386: single node SPARSEMEM fix

Magnus Damm
2005-09-08T01:45:38Z

On 9/8/05, Martin J. Bligh <mbligh@mbligh.org> wrote:
> --On Wednesday, September 07, 2005 10:28:36 -0700 Dave Hansen <haveblue@us.ibm.com> wrote:
>
> > On Tue, 2005-09-06 at 12:56 +0900, Magnus Damm wrote:
> >> This patch for 2.6.13-git5 fixes single node sparsemem support. In the case
> >> when multiple nodes are used, setup_memory() in arch/i386/mm/discontig.c calls
> >> get_memcfg_numa() which calls memory_present(). The single node case with
> >> setup_memory() in arch/i386/kernel/setup.c does not call memory_present()
> >> without this patch, which breaks single node support.
> >
> > First of all, this is really a feature addition, not a bug fix. :)
> >
> > The reason we haven't included this so far is that we don't really have
> > any machines that need sparsemem on i386 that aren't NUMA. So, we
> > disabled it for now, and probably need to decide first why we need it
> > before a patch like that goes in.
>
> CONFIG_NUMA was meant to (and did at one point) support both NUMA and flat
> machines. This is essential in order for the distros to support it - same
> will go for sparsemem.

Yes, by reading the code this becomes very clear. But what is the
current status? Is CONFIG_X86_GENERICARCH working right out of the box
on 2.6.13?

Thanks!

/ magnus