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

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Message-ID: <20120325092533.GA13307@liondog.tnic>
Date:	Sun, 25 Mar 2012 11:25:33 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...nel.org>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	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>,
	Harald Hoyer <harald@...hat.com>
Subject: Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via
 initrd

On Sat, Mar 24, 2012 at 03:44:10PM -0700, H. Peter Anvin wrote:
> On 03/24/2012 03:21 PM, H. Peter Anvin wrote:
> > The attached cpio-parsing code compiles to 458 bytes on x86-64 and 476
> > bytes on i386, and that is without any library dependencies at all.
> > Again, it will completely stop at the first compressed data item, so any
> > such kernel objects absolutely will have to be first.  In good Linux
> > tradition, it is also completely untested.
> > 
> > However, given that very reasonable size I would think that this is a
> > reasonable approach.  Anyone who has a better suggestion for the
> > namespace than "kernel/"?
> > 
> 
> Slightly improved version with actually working memcmp()...

[..]

> /*
>  * findcpio.c
>  *
>  * Find a specific cpio member; must precede any compressed content.

Looks simple enough. Btw, there's some cpio handling already done in
<init/initramfs.c> - probably reuse some of the code there...?

-- 
Regards/Gruss,
    Boris.
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