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Date: Thu, 5 Jun 2014 16:01:02 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Matt Fleming <matt@console-pimps.org>
Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
        Matt Fleming <matt.fleming@intel.com>,
        Matthew Garrett <mjg59@srcf.ucam.org>,
        Dave Hansen <dave.hansen@intel.com>, Borislav Petkov <bp@suse.de>
Subject: Re: [PATCH] x86/efi: Only pass mapped RAM regions to
 free_bootmem_late()
Message-ID: <20140605160102.3c58481e@www.etchedpixels.co.uk>
In-Reply-To: <1401974854-7716-1-git-send-email-matt@console-pimps.org>
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On Thu,  5 Jun 2014 14:27:34 +0100
Matt Fleming <matt@console-pimps.org> wrote:

> From: Matt Fleming <matt.fleming@intel.com>
> 
> free_bootmem_late() expects to only be passed RAM regions that the
> kernel can access, and that have a corresponding 'struct page'. It's
> possible for regions in the EFI memory map to reside in address ranges
> for which pfn_to_page() doesn't work, for instance when running on an
> i386 system with CONFIG_HIGHMEM=n.
> 
> This is in fact the case for one of Alan's machines where some of the
> EFI boot services pages live in highmem, and running a kernel without
> CONFIG_HIGHMEM enabled results in the following oops,
> 
>  BUG: unable to handle kernel paging request at f7f1f080
>  IP: [<c17fba96>] __free_pages_bootmem+0x5a/0xb8
>  *pdpt = 0000000001887001 *pde = 0000000001984067 *pte = 000000000 0000000
>  Oops: 0002 [#1] SMP

No improvement, and the if case is never true 8(

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