[PATCH 2/2] x86 e820: Introduce memmap=resetusablemap for kdump usage

[Yinghai Lu]

On Mon, Jan 28, 2013 at 6:27 PM, H. Peter Anvin <hpa at zytor.com> wrote:
> To be more clear: the max_pfn stuff seems like a relic of the past, and I am wondering what it would take to get rid of it.
>
> It clearly has the wrong semantics, except perhaps in the most trivial allocator models.
>
one thing i think could be : use that decide if we need iommu/swiotlb.
like in
arch/x86/kernel/amd_gart_64.c
arch/x86/kernel/pci-swiotlb.c
drivers/iommu/amd_iommu.c
...

Yinghai