linux-kernel - Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

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Message-ID: <20080128194017.GA4481@ucw.cz>
Date:	Mon, 28 Jan 2008 19:40:17 +0000
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ian Campbell <ijc@...lion.org.uk>,
	Mika Penttilä <mika.penttila@...umbus.fi>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

Hi!

> > >  /*
> > >   * Swap suspend & friends need this for resume because things like the intel-agp
> > >   * driver might have split up a kernel 4MB mapping.
> > >   */
> > > -char __nosavedata swsusp_pg_dir[PAGE_SIZE]
> > > +char swsusp_pg_dir[PAGE_SIZE]
> > 
> > thanks, applied.

Sorry, this is subtle and I've overlooked it before.

(I thought you were only changing ifdef).

Now you memcpy() over pg_dir when that pgdir is in use during swsusp
resume. Granted, you memcpy() with same data that already are there,
but it may still do some funny effects.

Hmm, but same argument applies to lower levels of paging in 64-bit and
PAE cases, and we still do that memcpy-over-active-pagetables there...
:-(.

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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