From: Ingo Molnar <mingo@elte.hu>
To: Hugh Dickins <hugh@veritas.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>, Peter Jones <pjones@redhat.com>,
Glauber Costa <gcosta@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Yinghai Lu <yhlu.kernel@gmail.com>,
Huang@elte.hu, Ying <ying.huang@intel.com>
Subject: Re: [PATCH] x86: fix Intel Mac booting with EFI
Date: Thu, 3 Jul 2008 08:18:02 +0200 [thread overview]
Message-ID: <20080703061802.GC9884@elte.hu> (raw)
In-Reply-To: <Pine.LNX.4.64.0807022239520.24137@blonde.site>
* Hugh Dickins <hugh@veritas.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@elte.hu>
Ingo
next prev parent reply other threads:[~2008-07-03 7:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-02 21:48 [PATCH] x86: fix Intel Mac booting with EFI Hugh Dickins
2008-07-03 6:18 ` Ingo Molnar [this message]
2008-07-03 6:28 ` Ingo Molnar
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