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

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Date:	Wed, 13 Feb 2008 16:59:30 -0800
From:	"Tony Luck" <tony.luck@...el.com>
To:	"David Miller" <davem@...emloft.net>
Cc:	mingo@...e.hu, rdreier@...co.com, linux-kernel@...r.kernel.org
Subject: Re: Strange hang on ia64 with CONFIG_PRINTK_TIME=y

> 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.

On ia64 per-cpu variables are mapped into the top 64K
of the address space.  Accessing them before the
resources to handle the access to that virtual address
have been set up would cause problems.

-Tony
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