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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