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Date: Fri, 23 Aug 2013 16:04:03 -0700
Message-ID: <CAE9FiQWO6KX7KViFLzhSFHfJsPj826=5Cd7z75JH=4257NRosw@mail.gmail.com>
Subject: Re: [PATCH 0/8] x86, acpi: Move acpi_initrd_override() earlier.
From: Yinghai Lu <yinghai@kernel.org>
To: chen tang <imtangchen@gmail.com>
Cc: Russ Anderson <rja@sgi.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Zhang Yanfei <zhangyanfei.yes@gmail.com>,
        Toshi Kani <toshi.kani@hp.com>, Tejun Heo <tj@kernel.org>,
        Tang Chen <tangchen@cn.fujitsu.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Bob Moore <robert.moore@intel.com>, Lv Zheng <lv.zheng@intel.com>,
        "Rafael J. Wysocki" <rjw@sisk.pl>, Ingo Molnar <mingo@elte.hu>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Renninger <trenn@suse.de>,
        Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
        Mel Gorman <mgorman@suse.de>,
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> 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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