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

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Date:	Sun, 25 Mar 2012 18:36:56 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>, 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 03/25/2012 01:54 AM, Borislav Petkov wrote:
> 
> One other downside for this approach would be the need to have
> initrd/initramfs support always compiled into the kernel in order to do
> all those things but, hey, distro kernels already have that so we're
> probably stuck with it anyway.
> 

In theory we could make the early stuff independent of the initramfs
code in the kernel -- just like we always build in an initramfs.

Not that it matters much, at this point the no-initramfs configurations
are mostly theoretical.

I was able to shave a bit more off the code... optimizing for size can
be fun sometimes.  The code is now 442 bytes on x86-64 and 413 on i386
when compiled with -O2 -fomit-frame-pointer; with -Os
-fomit-frame-pointer it is 372/410... all of that without any library
calls or relocations of any kind (which means it should be safe to call
from the prepaging environment.)

	-hpa

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