linux-kernel - Re: Crash while mapping memory in pagetable

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Message-ID: <461FE9D1.1000803@goop.org>
Date:	Fri, 13 Apr 2007 13:36:33 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Zachary Amsden <zach@...are.com>,
	Chris Wright <chrisw@...s-sol.org>, Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Crash while mapping memory in pagetable_init() (Was: Re: .config)

H. Peter Anvin wrote:
> I suggest, for clarity and to minimize bloat:

I think it would save a page, at most.  But OK.  (Also, if you're
running !PAE, these pages will actually become part of the init_mm
pagetable, so there's no memory wastage at all.)

> #ifdef CONFIG_X86_PAE
> # define PAGE_TABLE_SIZE    ((2048+4)*4096)
> #else
> # define PAGE_TABLE_SIZE    ((1024+1)*4096)

1024 should be enough; the pgd is still swapper_pg_dir, and there are no
pmds.

    J
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