linux-kernel - Re: [PATCH 2/2] x86 e820: Introduce memmap=resetusablemap for kdump usage

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Message-ID: <CAE9FiQUDP9x+6CZKyW8CVq7YWy+zQwSTqm67G-AuX0=LYgqf6A@mail.gmail.com>
Date:	Mon, 28 Jan 2013 18:31:28 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Renninger <trenn@...e.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	vgoyal@...hat.com, horms@...ge.net.au
Subject: Re: [PATCH 2/2] x86 e820: Introduce memmap=resetusablemap for kdump usage

On Mon, Jan 28, 2013 at 6:27 PM, H. Peter Anvin <hpa@...or.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
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