linux-kernel - Re: [PATCh] x86: overmapped fix when 4K pages on tail

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Message-ID: <20080713083322.16ebe80c@infradead.org>
Date:	Sun, 13 Jul 2008 08:33:22 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCh] x86: overmapped fix when 4K pages on tail - 64bit

On Sun, 13 Jul 2008 16:57:50 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> Arjan van de Ven <arjan@...radead.org> writes:
> 
> > On Wed, 9 Jul 2008 20:15:02 -0700
> > Yinghai Lu <yhlu.kernel@...il.com> wrote:
> >
> >> 
> >> 
> >> fix phys_pmd_init to make sure not to return big value than end.
> >> 
> >> also print out range split:1G/2M/4K
> >> 
> >> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
> >
> >
> > Making an accurate mapping solves a lot of potentially nasty/tricky
> > corner cases, so I like the approach
> 
> It also means that e.g. on a 1GB system the direct mapping will 
> never use 1GB pages.
> 
> And the CPU has to handle this anyways because all the old 
> kernels overmap and no x86 CPU can drop support for all old
> kernels.

for the 2mb case.. please find me a dimm which isn't a multiple of
2Mb ;-)

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