linux-kernel - Re: [PATCH] timekeeping: drop irq-context clocksource polling

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Date:	Sat, 7 Apr 2007 03:19:22 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	linux-kernel@...r.kernel.org, johnstul@...ibm.com, mingo@...e.hu
Subject: Re: [PATCH] timekeeping: drop irq-context clocksource polling

On Thu, 05 Apr 2007 14:03:16 -0700 Daniel Walker <dwalker@...sta.com> wrote:

> Before this change the timekeeping code would poll the clocksource
> list every interrupt. This changes that so the clocksource list is
> only checked when there has been and update, and no longer checks
> in interrupt context.

I get a complete lockup on i386 SMP - before the kernel has printed anything.

I'm suspecting a recursive taking of xtime_lock.
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