Re: 2.6.23-rc1-mm1: boot hang on ia64 with memoryless nodes

[Lee Schermerhorn <Lee.Schermerhorn@hp.com>]

On Thu, 2007-07-26 at 09:53 -0400, Lee Schermerhorn wrote:
> On Wed, 2007-07-25 at 17:18 -0400, Lee Schermerhorn wrote: 
> > On Wed, 2007-07-25 at 12:38 -0700, Christoph Lameter wrote:
> > > (ccing Andy who did the work on the config stuff)
> > > 
> > > On Wed, 25 Jul 2007, Lee Schermerhorn wrote:
> > > 
> > > > I tried to deselect SPARSEMEM_VMEMMAP.  Kconfig's "def_bool=y" wouldn't
> > > > let me :-(.  After hacking the Kconfig and mm/sparse.c to allow that,
> > > > boot hangs with no error messages shortly after "Built N zonelists..."
> > > > message.
> > > 
> > > I get a similar hang here and see the system looping in softirq / hrtimer 
> > > code.
> > > 
> > > > Backed off to DISCONTIGMEM+VIRTUAL_MEMORY_MAP, and saw same hang as with
> > > > (SPARSMEM && !SPARSEMEM_VMEMMAP).   
> > > 
> > > So its not related to SPARSE VMEMMAP? General VMEMMAP issue on IA64?
> > 
> > This hang is different from the one I see with SPARSE VMEMMAP -- no
> > "Unable to handle kernel paging request..." message.  Just hangs after
> > "Built N zonelists..."  and some message about "color" that I didn't
> > capture.  Next time [:-(]...
> 
> The "color" message was actually:
> 
> Console:  colour dummy device 80x25
> 
> So, now I'm wondering if I'm hitting the "Regression in serial
> console..." issue, and the system was actually booting--I just didn't
> see any output.  If so, the "Unable to handle kernel paging request..."
> hang might well be a problem with SPARSEMEM_VMEMMAP...
> 

After applying the hotfixes from Andrew's repository and the patches
from the mailing lists listed below, I'm booting 23-rc1-mm1 with a zx1
specific config [on an sx1000].  Gotta run for a meeting, but I'll try
generic kernel this pm.  Then back to testing memoryless node
patches, ...

Other "hot fixes":

2 of Mel Gorman's patches to fix ia64 mmap corruption [mm list]
Yasuaki Ishimatsu's assign irq vector fix [ia64 list]
Kenji Kaneshige's "wrong access to vector" patch [ia64 list]
Kame-san's sparsemem-vmemmap fix [lkml]

Lee