linux-kernel - Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via initrd

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Message-ID: <CAE9FiQXvi-HPO+Ct=k0Ga_uaTrntJW=nh-VKnGbXaovFN=zDaQ@mail.gmail.com>
Date:	Fri, 23 Mar 2012 21:50:12 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Renninger <trenn@...e.de>, eric.piel@...mplin-utc.net,
	vojcek@...n.pl, dsdt@...gusch.at, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Lin Ming <ming.m.lin@...el.com>, lenb@...nel.org,
	robert.moore@...el.com, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via initrd

On Fri, Mar 23, 2012 at 9:43 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> Can this be implemented without using dynamic memory allocations?
>> If not, it's not suitable for early APCI overriding.
>
> Yes it can, as long as it is uncompressed.  It just becomes a matter of
> walking the cpio headers which is effectively a linked list.

During checking in reserve_inirtd() (BTW, the name of the function is outdated).
memblock is ready.
So dynamical memory allocation is there already.

also could put that headers in the tail, so old intird utilities could
work as before.

Yinghai
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