[patch] voluntary-preempt-2.6.9-rc1-bk4-Q4

[Ingo Molnar]

* Lee Revell <rlrevell@xxxxxxxxxxx> 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
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