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

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Message-ID: <1FE6DD409037234FAB833C420AA843EC97C8B0@orsmsx424.amr.corp.intel.com>
Date:	Thu, 14 Feb 2008 14:23:59 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Roland Dreier" <rdreier@...co.com>
Cc:	"David Miller" <davem@...emloft.net>, <mingo@...e.hu>,
	<linux-kernel@...r.kernel.org>
Subject: RE: Strange hang on ia64 with CONFIG_PRINTK_TIME=y

> I guess sched_init() is too early... it does seem really strange to
> me, but I just double checked with Ingo's patch and it does indeed
> hang.  The slow way to make progress is just to go through
> start_kernel() line-by-line and enable cpu_clock() at each stage, and
> see where it stops hanging.  I'll give that a shot as a background
> process (my ia64 box takes quite a while to boot, so each test takes a
> long time but requires very little of my attention).

We *ought* to be safe after cpu_init() ... which is called from setup_arch(),
which is several calls before sched_init().

Thanks for looking at this though ... my ability to test just went
away for a while ... some lab re-organization means all my systems
just got powered off and removed from their rack so the rack can be
moved to a new location.

-Tony
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