linux-kernel - Re: [Provisional Page Table] Why the linear address ranges starting both from 0 and PAGE_OFFSET are mapped to the same physical address range in the provisional page table?

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Message-ID: <CABexPfGnGm=qa-SVhD_z+Wmhp31Of2X4s9LmuR32K+FH6jo9Bw@mail.gmail.com>
Date:	Sat, 3 Dec 2011 13:27:35 +0800
From:	zhihua che <zhihua.che@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [Provisional Page Table] Why the linear address ranges starting
 both from 0 and PAGE_OFFSET are mapped to the same physical address range in
 the provisional page table?

Here is another relating question. Why the provisional page table is
stored at initial_page_table while final page table is store at
swapper_pg_dir, I think only one page directory table is enough,
because the two page table are not effective in the same time, it's
enough to construct the provisional page table at swapper_pg_dir, then
clear it and construct the final page table. And I find that in the
previous linux kernel, only swapper_pg_dir is present.
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