Date: Fri, 25 Mar 2005 16:29:26 -0800
From: "David S. Miller" <davem@davemloft.net>
To: "David S. Miller" <davem@davemloft.net>
Cc: nickpiggin@yahoo.com.au, hugh@veritas.com, akpm@osdl.org,
       tony.luck@intel.com, benh@kernel.crashing.org, ak@suse.de,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/6] freepgt: free_pgtables use vma list
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On Fri, 25 Mar 2005 09:23:12 -0800
"David S. Miller" <davem@davemloft.net> wrote:

> On Fri, 25 Mar 2005 16:32:07 +1100
> Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> 
> > So, to make the question more concrete: if a pgd_t is freed due
> > to freeing the single pmd_t contained within it (which was the
> > only part of the pgd's address space that contained a valid mapping)
> > Then do you need the full PGDIR_SIZE width passed to
> > flush_tlb_pgtables, or just the PMD_SIZE'd start,end that covered
> > the freed pmd_t?
> 
> Just the PMD_SIZE'd start,end is necessary.

Since sparc64 is the only user of this thing...

Let's make it so that the flush can be queued up
at pmd_clear() time, as that's what we really want.

Something like:

	pmd_clear(mm, vaddr, pmdp);

I'll try to play with something like this later.
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