[Crash-utility] crash-4.0-2.10 ppc64 4-level pagetable fixes

[Haren Myneni]

crash-utility-bounces at redhat.com wrote on 11/09/2005 05:23:09 AM:

> Badari Pulavarty wrote:
> 
> > On Tue, 2005-11-08 at 17:17 -0500, Dave Anderson wrote:
> > > Badari Pulavarty wrote:
> > >
> > > > On Tue, 2005-11-08 at 14:52 -0500, Dave Anderson wrote:
> > > > > BTW-- what kernel version introduced this change for ppc64?
> > > >
> > > > 4-level pagetable went into 2.6.14 for ppc64.
> > > > Yuck. That reminds me that "pud_clear_bad()" is not a good
> > > > choice for detecting new layout (its a generic routine - not
> > > > ppc64 specific and is in 2.6.11 onwards).
> > > >
> > > > Funny thing is, I am not sure original crash is working
> > > > on pre-2.6.14 kernel either. I see PTE_SHIFT changed from
> > > > 16 to 17 in 2.6.10. I guess crash is broken from 2.6.10
> > > > onwards for ppc64.
> > > >
> > > > 2.6.10 onwards:
> > > > #define PTE_SHIFT (17)
> > > >
> > > > < 2.6.10: (which crash understands)
> > > > #define PTE_SHIFT (16)
> > >
> > > The PTE_SHIFT change was orthogonal to the intro of 4-level page 
tables?
> > > You would think that they would be tied together, no?
> >
> > PTE_SHIFT is orthogonal to 4-level changes and it happened in 2.6.10.
> > My point is, "crash" wouldn't work for kernels between 2.6.10-2.6.14
> > (even with my changes).
> 
> Right -- that's what I thought you were implying.  Does that bother
> you guys (IBM)?  I'm looking at throught Red-Hat-colored glasses,
> presuming that RHEL5 will be based on 2.6.14 or later.  It seems to
> be a rather large hole, but I'll let you guys decide on how to best
> handle it (or not) .

That should be OK. We can get back to this (2.6.10-2.6.14 support) if 
someone wants it. 

Thanks
Haren
> 
> Dave
> 
> --
> Crash-utility mailing list
> Crash-utility at redhat.com
> https://www.redhat.com/mailman/listinfo/crash-utility
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/crash-utility/attachments/20051109/4e09bf64/attachment.htm>