[Crash-utility] crash-4.0.2.12 PPC64 changes to make itunderstand64k pagesize

[Dave Anderson]

Badari Pulavarty wrote:

>
> > Let me run crash tool on RHEL4 vmcore (I believe, I saved vmlinux and
> > vmcore created on RHEL4 kernel). Yes, it should support backward
> > compatible since we did not change the previous code patch even though
> > we should be having one vtop with the new approach. But, we will check
> > on previous vmcore or on live RHEL4 kernel.
>
> No. We still we have 2 vtop() functions. One for old kernels (pre-4level
> changes - which also works on 2.4 kernels). Other for kernels with
> 4-level pagetables, 64K page support.
>

Actually I'd *much* prefer that the old vtop be left in place, because
the old one support both RHEL3 and RHEL4 kernels, covering my ass nicely...  ;-)

>
> I guess, make a single vtop() which works on all kernels: 2.4 kernels,
> 2.6 pre-level4 changes, 4-level pagetables changes, 64k pagesupport etc.
> But I really don't have bandwidth to understand all the shifts and
> masks, make changes to incorporate all of differences & back and test
> every single one of them (I have no interest or time testing 2.4
> kernels).
>

I agree -- it's not a big deal that there are 2 vtop functions.

Dave