Re: 4.0-rc1/PARISC: BUG: non-zero nr_pmds on freeing mm

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On Wed, 25 Feb 2015 22:47:43 +0200 "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx> wrote:

> > > If not, I can prepare a patchset which only adds missing
> > > __PAGETABLE_PUD_FOLDED and __PAGETABLE_PMD_FOLDED.
> > 
> > Something simple would be preferred, but I don't know how much simpler
> > the above would be?
> 
> Not much simplier: __PAGETABLE_PMD_FOLDED is missing in frv, m32r, m68k,
> mn10300, parisc and s390.

I don't really know what's going on here.  Let's rewind a bit, please. 
What is the bug, what causes it, which commit caused it and why the
heck does it require a massive patchset to fix 4.0?

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