linux-kernel - Re: [Bug 41722] Clevo M5X0JE hangs in ACPI init

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Message-ID: <CA+55aFzMhJgqpc6YOSDC75wf2jEofy_J79uO3=64MFV+T=ET_w@mail.gmail.com>
Date:	Tue, 24 Jan 2012 16:34:23 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Rogério Brito <rbrito@....usp.br>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Edward Donovan <edward.donovan@...ble.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org,
	Márcia Coutinho de Brito <mcbrito@...il.com>,
	Ram Pai <linuxram@...ibm.com>, rui.zhang@...el.com
Subject: Re: [Bug 41722] Clevo M5X0JE hangs in ACPI init

2012/1/24 Yinghai Lu <yinghai@...nel.org>:
>
> Your bios does not have RAM page aligned...

That's pretty common. BIOS tables etc are seldom page-aligned, and
afaik we handle it all correctly. Look for PFN_UP(start) and
PFN_DOWN(start+length) patterns in both e820.c and memblock.c.

Sure, it is _possible_ that we have some place we screw up in, but I
think it's unlikely. As mentioned, non-page-aligned memory is quite
common, especially in the low BIOS region just under the 640kB mark.

                     Linus
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