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

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Message-ID: <5ea70988-10fb-4153-9482-75507efe0b07@email.android.com>
Date:	Mon, 28 Jan 2013 19:33:52 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
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

I guess that very limited use might make sense.

Yinghai Lu <yinghai@...nel.org> wrote:

>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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