linux-kernel - Re: [2.6.25-rc5-mm1] BUG: spinlock bad magic early during boot

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Date:	Sat, 15 Mar 2008 13:19:24 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	?ric Piel <Eric.Piel@...mplin-utc.net>
cc:	Tilman Schmidt <tilman@...p.cc>, Dave Hansen <haveblue@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Renninger <trenn@...e.de>,
	Len Brown <len.brown@...el.com>,
	Christoph Hellwig <hch@...radead.org>,
	Markus Gaugusch <dsdt@...gusch.at>, linux-acpi@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>,
	Arjan van de Ven <arjanv@...hat.com>
Subject: Re: [2.6.25-rc5-mm1] BUG: spinlock bad magic early during boot



On Sat, 15 Mar 2008, ?ric Piel wrote:
>
> It's a pity, I had just nearly finished a new approach. Instead of
> relying on populate_rootfs() and the filesystem infrastructure, the new
> approach directly finds the file in the initramfs.

So that avoids the VFS layer issues, but it's still strictly much worse 
than just having a run-time loading.

What's the problem with just loading a new DSDT later? Potentially as in 
*much* later: including when user-space is all up-and-running? 

For things like DVD install images, you'd quite possibly want to have a 
few known-workaround DSDT images with the installer, and just say "ok, we 
want to fix up this ACPI crap in order to get working suspend/resume" kind 
of thing.

So what's the reason for pushing for this insanely-early workaround in the 
first place, instead of letting user-space do something like

	cat my-dsdt-image > /proc/sys/acpi/DSDT

or whatever at runtime?

		Linus
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