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

Ingo Molnar
2004-08-29T05:42:15Z

* 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