linux-kernel - Re: [PATCH] x86: introduce max_low_pfn

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Date:	Fri, 11 Jul 2008 10:51:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	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: introduce max_low_pfn_mapped for 64bit


* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> On Fri, Jul 11, 2008 at 1:26 AM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Yinghai Lu <yhlu.kernel@...il.com> wrote:
> >
> >> when 4g more memory installed, don't map big hole below 4g.
> >
> > applied to tip/x86/core, thanks Yinghai.
> >
> > This is a scarier change - no way to do it in smaller steps?
> 
> 1. e820_end ==> e820_end_of_ram_pfn :: totally safe...
> 2. others

yeah. I'd also split out the introduction of max_low_pfn_mapped into a 
separate, safe patch as well. I.e. first patch just introduces it, 
second patch makes use of it.

the #ifdef 64-bit assymetry looks a bit ugly too.

	Ingo
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