linux-kernel - Re: Strange hang on ia64 with CONFIG_PRINTK

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Message-Id: <20080213.050340.64342037.davem@davemloft.net>
Date:	Wed, 13 Feb 2008 05:03:40 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	rdreier@...co.com, linux-kernel@...r.kernel.org
Subject: Re: Strange hang on ia64 with CONFIG_PRINTK_TIME=y

From: Ingo Molnar <mingo@...e.hu>
Date: Wed, 13 Feb 2008 13:57:25 +0100

> so .. how about the patch below? Note that we already had an "early 
> bootup" special (the rq->idle check), it's now just made explicit via 
> the scheduler_running flag.

I don't see what the problem is.

It is legal to access per-cpu data as early as you like,
it just evaluates to the static copy in the per-cpu section
of the kernel image until the per-cpu areas are setup.

rq->idle should also be zero this early as well, that's
also legal to rely upon

I see nothing illegal in what cpu_clock() is doing, that's
why I fixed the sparc64 per-cpu problem I ran into since
sparc64 was doing the wrong thing when booted on a non-zero
cpu.
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