From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Date: Fri, 28 Apr 2006 17:16:25 +0000
Subject: RE: [rfc] dynamic 3-level / 4-level page table
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To: linux-ia64@vger.kernel.org

Zoltan Menyhart wrote on Friday, April 28, 2006 1:58 AM
> Could you please describe how e.g. the VHPT miss handler works
> with the modification?
> Especially the "LOAD_PGD()" related operations.

LOAD_PGD() is a clone of pud_offset():

+#define pud_offset(dir,addr)	((pud_t *) (pgtbl3 ? (u64) (dir) : pgd_page(*(dir))) + \
+				(((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))

Except pgtbl3 condition is evaluated only once at boot time.