linux-kernel - Re: [tip:x86/urgent] x86, efi: Delete efi_ioremap() and fix CONFIG_X86

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Date:	Mon, 12 Mar 2012 22:39:00 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matt Fleming <matt.fleming@...el.com>
Cc:	"H. Peter Anvin" <hpa@...nel.org>, mingo@...hat.com,
	mjg@...hat.com, linux-kernel@...r.kernel.org, keithp@...thp.com,
	rui.zhang@...el.com, huang.ying.caritas@...il.com,
	stable@...r.kernel.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86, efi: Delete efi_ioremap() and fix
 CONFIG_X86_32 oops

On Mon, Mar 12, 2012 at 5:38 AM, Matt Fleming <matt.fleming@...el.com> wrote:

> Have you tested my patch? Have you hit this bug or is it just from code
> inspection. I'm starting to feel a bit silly now because I can't see the
> problem you're describing.

from code inspection.

your new init_memory_mapping() will only map mem under max_low_pfn ?

and before that calling for x86_64, max_low_pfn is not updated to max_pfn yet.

+       max_pfn_mapped = init_memory_mapping();

 #ifdef CONFIG_X86_64
       if (max_pfn > max_low_pfn) {
-               max_pfn_mapped = init_memory_mapping(1UL<<32,
-                                                    max_pfn<<PAGE_SHIFT);
               /* can we preseve max_low_pfn ?*/
               max_low_pfn = max_pfn;
       }

Please do find one system with more than 4G to test the code.

Thanks

Yinghai
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