* Steven Rostedt <[email protected]> wrote:
> Ingo,
>
> My first try at booting -rt8 on my machine crashed immediately. No
> nmi, no nothing. Just a lockup at the registration of the ACPI_PM
> timer. This would happen every time, and after struggling for a while,
> I finally found out why!
>
> The printk in timeofday_periodic_hook that is called holding the
> write_lock of system_time_lock (a raw_seq_lock) was causing lots of
> havoc. The printk would turn on interrupts, and then I would get a
> deadlock when the interrupt would do a read on system_time_lock.
argh. This piece of code has caused so many problems already. Some
people want console drivers to be preemptible, but i guess being able to
boot trumps things ;)
could you check out the variant in 2.6.15-rt11 - i tweaked it slightly
over yours, hopefully making the behavior more consistent.
Ingo
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