On Friday 03 November 2006 22:17, Amul Shah wrote:
> On Fri, 2006-11-03 at 20:52 +0100, Andi Kleen wrote:
> > On Friday 03 November 2006 20:47, Amul Shah wrote:
> >
> > > Andi, Vivek is right. We can use end_pfn_map. My observation is wrong.
> >
> > Ok. Then my patch should work?
>
> The patch does work on a 2.6.16 derived kernel (SLES 10 kernel). The
> 2.6.19-rc4 kernel is doing some funny things when I use it as a kdump
> kernel (regardless of the patch).
Magnus had another patch for that which I applied
ftp://ftp.firstfloor.org/pub/ak/x86_64/quilt/patches/setup-saved_max_pfn-correctly-kdump
Does it work with that?
> > > Vivek, the problem condition is in generic reserve_bootmem_core
> > > (mm/bootmem.c), where this
> > > BUG_ON(PFN_DOWN(addr) >= bdata->node_low_pfn);
> > > checks the target address against the top of that node's memory.
> >
> > In general these early BUGs should be eliminated - they are always
> > messy because the kernel exception handlers are not fully functional
> > yet. printks or worst case panics are better.
> >
> > -Andi
>
> I assume that we are not going to change mm/bootmem.c since your patch
> works. Am I right?
Yep.
-Andi
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