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

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Date:	Tue, 8 Jul 2008 17:47:56 -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 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.
>
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
> ---

please check

[PATCH] x86: introduce page_size_mask for 64bit
http://lkml.org/lkml/2008/7/8/49
[PATCH] x86: not overmap than end in init_memory_mapping - 64bit
http://lkml.org/lkml/2008/7/8/50

with this patch, on system that support gbpages
change
last_map_addr: 1080000000 end: 1078000000
to
last_map_addr: 1078000000 end: 1078000000

/sys/kernel/debug/kernel_page_tables
0xffff881040000000-0xffff881074400000         836M     RW         PSE GLB NX pmd
0xffff881074400000-0xffff8810744b0000         704K     RW             GLB NX pte
0xffff8810744b0000-0xffff8810744c0000          64K     RW     PCD     GLB NX pte
0xffff8810744c0000-0xffff881074600000        1280K     RW             GLB NX pte
0xffff881074600000-0xffff881080000000         186M     RW         PSE
GLB NX pmd ---> wrong
0xffff881080000000-0xffff888000000000         446G                           pud
0xffff888000000000-0xffffc20000000000       58880G                           pgd
===>
0xffff881040000000-0xffff881074400000         836M     RW         PSE GLB NX pmd
0xffff881074400000-0xffff8810744a0000         640K     RW             GLB NX pte
0xffff8810744a0000-0xffff8810744b0000          64K     RW     PCD     GLB NX pte
0xffff8810744b0000-0xffff881074600000        1344K     RW             GLB NX pte
0xffff881074600000-0xffff881078000000          58M     RW         PSE GLB NX pmd
0xffff881078000000-0xffff881080000000         128M                           pmd
0xffff881080000000-0xffff888000000000         446G                           pud
0xffff888000000000-0xffffc20000000000       58880G                           pgd

YH
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