linux-kernel - Re: "double" hpet clocksource && hard freeze [bisected]

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Date:	Fri, 24 Aug 2007 18:13:26 +0200
From:	Paolo Ornati <ornati@...twebnet.it>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	"Bob Picco" <bob.picco@...com>,
	"john stultz" <johnstul@...ibm.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: "double" hpet clocksource && hard freeze [bisected]

On Fri, 24 Aug 2007 09:04:22 -0700
"Luck, Tony" <tony.luck@...el.com> wrote:

> It is good to avoid registering two clocksources with the same name, but
> the fix might be a bit more fragile than the eariler one that temporarily
> marked the drivers/char/hpet.c one as CONFIG_IA64 only.  Given that the
> hang went away when you applied the earlier patch, I conclude that the
> drivers/char/hpet.c code is the one that got selected when you had two
> "hpet" entries ... and that there is something wrong with that code that
> doesn't work right on x86_64.  The fix to prevent registering a duplicate
> name is presumably working for you simply because arch/x86_64/kernel/hpet.c
> happens to get there first with its "hpet", so the drivers/char/hpet.c one
> is dropped.  If something changed that reversed the order of these registrations,
> then you'd get the "hpet" clocksource that results in a hang.

100% agree

-- 
	Paolo Ornati
	Linux 2.6.23-rc3-g1a8f4610-dirty on x86_64
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