linux-kernel - Re: -tip tree resume fail, bisect to 5bd5a45(x86: Add NX protection for kernel data)

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Message-ID: <20101122164247.GC21836@basil.fritz.box>
Date:	Mon, 22 Nov 2010 17:42:47 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	castet.matthieu@...e.fr, Lin Ming <ming.m.lin@...el.com>,
	Siarhei Liakh <sliakh.lkml@...il.com>,
	Xuxian Jiang <jiang@...ncsu.edu>, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	lkml <linux-kernel@...r.kernel.org>, tglx <tglx@...utronix.de>
Subject: Re: -tip tree resume fail, bisect to 5bd5a45(x86: Add NX
 protection for kernel data)

> That seems to be a S3 specific code path, that won't fix anything.
> Simply do:
> 
> echo 0 > /sys/devices/system/cpu/cpu1/online;
> echo 1 > /sys/devices/system/cpu/cpu1/online;
> 
> and your machine will explode..

The SMP startup trampoline is copied I believe
and only executed in real mode without page tables.

So it's perhaps not the trampoline, but the early startup 
code that ends up being broken.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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