linux-kernel - Re: [patch] tip/x86_64: fix e820 merge issue which broke max_pfn

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Date:	Wed, 9 Jul 2008 10:00:06 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"mingo@...e.hu" <mingo@...e.hu>, "hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [patch] tip/x86_64: fix e820 merge issue which broke max_pfn_mapped

On Tue, Jul 08, 2008 at 05:59:39PM -0700, Yinghai Lu wrote:
> On Tue, Jul 8, 2008 at 4:08 PM, Suresh Siddha <suresh.b.siddha@...el.com> wrote:
> > With out this 64bit tip/master doesn't boot using ACPI on my system.
> > ---
> >
> > max_pfn_mapped should include all e820 entries.
> > The direct mapping extends to max_pfn_mapped, so that we can directly access
> > apertures, ACPI and other tables without having to play with fixmaps.
> >
> > With this, my system with 1GB memory boots fine with ACPI enabled.
> 
> so without this patch, your system doesn't boot?

It doesn't enable ACPI and hence doesn't bringup SMP etc etc..
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