linux-kernel - Re: [PATCH] x86: fix Intel Mac booting with EFI

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Date:	Thu, 3 Jul 2008 08:18:02 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Peter Jones <pjones@...hat.com>,
	Glauber Costa <gcosta@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>,
	Huang@...e.hu, Ying <ying.huang@...el.com>
Subject: Re: [PATCH] x86: fix Intel Mac booting with EFI


* Hugh Dickins <hugh@...itas.com> wrote:

> Fedora reports that mem_init()'s zap_low_mappings(), extended to SMP 
> in 61165d7a035f6571c7576e7f51e7230157724c8d x86: fix app crashes after 
> SMP resume causes 32-bit Intel Mac machines to reboot very early when 
> booting with EFI.
> 
> The EFI code appears to manage low mappings for itself when needed; 
> but like many before it, confuses PSE with PAE.  So it has only been 
> mapping half the space it needed when PSE but not PAE.  This remained 
> unnoticed until we moved the SMP zap_low_mappings() before 
> efi_enter_virtual_mode().  Presumably could have been noticed years 
> ago if anyone ran a UP kernel on such machines?

good spotting!

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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