cpu_up not called for boot cpu

cpu_up not called for boot cpu

[Keith Owens]

cpu_up() is only called for secondary cpus, not for the boot cpu.  That
means that code hooked into the cpu_chain notifier never gets called
for the boot cpu, which prevents additional subsystems from taking
action for the boot cpu.  So how are additional subsystems meant to be
initialised for the boot cpu?

Re: cpu_up not called for boot cpu

[Heiko Carstens]

On Wed, Jun 28, 2006 at 01:41:03PM +1000, Keith Owens wrote:
> cpu_up() is only called for secondary cpus, not for the boot cpu.  That
> means that code hooked into the cpu_chain notifier never gets called
> for the boot cpu, which prevents additional subsystems from taking
> action for the boot cpu.  So how are additional subsystems meant to be
> initialised for the boot cpu?

Looks like you need to add your subsystem's call to do_pre_smp_initcalls().

Re: cpu_up not called for boot cpu

[Andi Kleen]

Keith Owens <kaos@sgi.com> writes:

> cpu_up() is only called for secondary cpus, not for the boot cpu.  That
> means that code hooked into the cpu_chain notifier never gets called
> for the boot cpu, which prevents additional subsystems from taking
> action for the boot cpu.  So how are additional subsystems meant to be
> initialised for the boot cpu?

They ought to initialize themselves for the already online cpus
when they start.

Any other way would make them lose CPUs if they were loaded
after the other CPUs are added.

-Andi