From: William Lee Irwin III <wli@holomorphy.com>
To: john stultz <johnstul@us.ibm.com>
Cc: lkml <linux-kernel@vger.kernel.org>, James <jamesclv@us.ibm.com>,
keith maanthey <kmannth@us.ibm.com>,
Chris McDermott <lcm@us.ibm.com>
Subject: Re: [RFC][PATCH] fix target_cpus() for summit subarch
Date: Fri, 27 Aug 2004 19:02:57 -0700 [thread overview]
Message-ID: <20040828020257.GX2793@holomorphy.com> (raw)
In-Reply-To: <1093652688.14662.16.camel@cog.beaverton.ibm.com>
On Fri, Aug 27, 2004 at 05:24:48PM -0700, john stultz wrote:
> I've been hunting down a bug affecting IBM x440/x445 systems where the
> floppy driver would get spurious interrupts and would not initialize
> properly.
> After digging James Cleverdon pointed out that target_cpus() is routing
> the interrupts to the clustered apic broadcast mask. This was causing
> multiple interrupts to show up, breaking the floppy init code.
> This one-liner fix simply routes interrupts to the first cpu to resolve
> this issue.
> Any comments or feedback would be appreciated.
You're using fixed delivery mode, so non-singleton destinations break.
If lowest prio delivery mode saw this, you'd have IO-APIC errata.
-- wli
next prev parent reply other threads:[~2004-08-28 2:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-28 0:24 [RFC][PATCH] fix target_cpus() for summit subarch john stultz
2004-08-28 2:02 ` William Lee Irwin III [this message]
2004-08-28 6:17 ` Martin J. Bligh
2004-08-30 18:03 ` john stultz
2004-08-30 20:46 ` john stultz
2004-08-30 21:24 ` James Cleverdon
2004-08-31 1:06 ` john stultz
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