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Date: Sun, 29 Aug 2004 07:43:39 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Daniel Schmitt <pnambic@unu.nu>, "K.R. Foley" <kr@cybsft.com>,
       Felipe Alfaro Solana <lkml@felipe-alfaro.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Mark_H_Johnson@raytheon.com
Subject: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q4
Message-ID: <20040829054339.GA16673@elte.hu>
References: <20040823221816.GA31671@yoda.timesys> <1093715573.8611.38.camel@krustophenia.net> <20040828194449.GA25732@elte.hu> <200408282210.03568.pnambic@unu.nu> <20040828203116.GA29686@elte.hu> <1093727453.8611.71.camel@krustophenia.net> <20040828211334.GA32009@elte.hu> <1093727817.860.1.camel@krustophenia.net> <1093737080.1385.2.camel@krustophenia.net> <1093746912.1312.4.camel@krustophenia.net>
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* Lee Revell <rlrevell@joe-job.com> wrote:

> Some more info:
> 
> This bug is 100% reproducible.  During boot, as soon as the i8042 driver
> is loaded:
> 
> serio: i8042 AUX port at 0x60,0x64 irq 12
> serio: i8042 KBD port at 0x60,0x64 irq 1
> input: AT Translated Set 2 keyboard on isa0060/serio0
> 
> the keyboard freezes, with 'Num Lock' stuck on.
> 
> The problem only occurs when CONFIG_PREEMPT_HARDIRQS=y.  Works fine
> otherwise.

i suspect it's the generic_synchronize_irq() change. Does -Q4 boot?:

  http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc1-bk4-Q4

-Q4 reverts this change. (this doesnt solve the problems Scott noticed
though.)

another solution would be to boot Q3 with preempt_hardirqs=0 and then
turn on threading for all IRQs but the keyboard.

	Ingo