linux-kernel - Re: [PATCH] x86/efi: Only pass mapped RAM regions to free_bootmem

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Date:	Thu, 05 Jun 2014 07:43:44 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Matt Fleming <matt@...sole-pimps.org>, linux-efi@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matt Fleming <matt.fleming@...el.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH] x86/efi: Only pass mapped RAM regions to free_bootmem_late()

On 06/05/2014 06:27 AM, Matt Fleming wrote:
> 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.

FWIW, I think there are also a bunch of ways to hit this if someone uses
mem=, even on 64-bit.
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