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

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Message-ID: <86802c440807081856y17eb1f1cs5647b2c2a765f429@mail.gmail.com>
Date:	Tue, 8 Jul 2008 18:56:38 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Suresh Siddha" <suresh.b.siddha@...el.com>
Cc:	mingo@...e.hu, hpa@...or.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] tip/x86_64: fix e820 merge issue which broke max_pfn_mapped

On Tue, Jul 8, 2008 at 5:59 PM, Yinghai Lu <yhlu.kernel@...il.com> 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?

how about attached patch?

[PATCH] x86: make max_pfn cover acpi table below 4g

when system have 4g less ram installed, and acpi table sit
near end of ram. make max_pfn cover them too.
so 64bit kernel don't need to mess up fixmap

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

YH

View attachment "e820_end.patch" of type "text/x-patch" (3356 bytes)