RE: [Xen-devel] [PATCH] arch/xen pudding

[Rik van Riel <riel@xxxxxxxxxx>]

On Fri, 7 Jan 2005, Ian Pratt wrote:

> > This patch adds the 'pud' level to Xen page table handling, making
> > it compile with the 4 level page table code that's in the latest
> > 2.6 kernel tree.  This will be needed once Xen moves to 2.6.11.
> I've heard that there is going to be a new 3-level pt compatability
> header file to enable architectures to work unmodified. Do you know if
> this is still going to happen? (We'll obviously want to switch to
> 4-level pagetables to make it easier to track the i386 patches)
I think this is not the case, and architectures really do need to
be changed to know about the pud level pgd -> pud -> pmd -> pte.

> Since users frequently want to be able to use kernels other than the
> most recent, we're going to need to think about how best to separate xen
> bug fix patches from patches associated with kernel upgrades. We might
> be best off creating a linux bk tree for every kernel version, and try
> to pull down bug fixes into each tree. Sounds like a right pain...
I suspect that might be a waste of your time - better let distro
kernel hackers take care of that for you.

--
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan


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