linux-kernel - Re: [PATCH 0/8] x86, acpi: Move acpi_initrd

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Date:	Fri, 23 Aug 2013 16:04:03 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	chen tang <imtangchen@...il.com>
Cc:	Russ Anderson <rja@....com>, "H. Peter Anvin" <hpa@...or.com>,
	Zhang Yanfei <zhangyanfei.yes@...il.com>,
	Toshi Kani <toshi.kani@...com>, Tejun Heo <tj@...nel.org>,
	Tang Chen <tangchen@...fujitsu.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Bob Moore <robert.moore@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Renninger <trenn@...e.de>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/8] x86, acpi: Move acpi_initrd_override() earlier.

> So we need to allocate memory. That is why you suggested to use BRK, right ?
> And the size seems to be a problem.
>
> So I suggest to use early_ioremap().
>
> 1. After paging is enabled, before direct mapping page tables are
> setup, we map the
>     initrd with early_ioremap(). And we are able to access it with va,
> even on 32bit.
>     Then we can find all tables.
> 2. We still use memblock to allocate memory. Maybe it will be
> hotpluggable memory,
>     but this memory can be freed when all the acpi tables are parsed, right ?
>
> So I want to try early_ioremap(). All these should be done in setup_arch().

no.
cpio search need to take whole range virtual address,
and early_ioremap has size limitation.
you will have to update cpio search to take mapping function.
could be too messy.

Yinghai
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