Re: [PATCH 0/4] Hacks to allow booting ARM SMP kernel on UP ARMv7

[Tony Lindgren <tony@atomide.com>]

* Russell King - ARM Linux <linux@arm.linux.org.uk> [100906 03:36]:
> Here's my latest patch (which is combined from two patches.)
> 
> Tony, could you follow up with patches for anything which is still
> required - I think there's two things you've addressed which this
> currently misses:
> 
> 1. not initializing twd_base (I'm not convinced this is safe - rather
>    making smp_prepare_cpus() return early is probably a better idea.)
> 2. __flush_icache_all()
> 
> Note that (2) seems to be complicated by the instruction only being
> available on ARMv7 and later.

Yeah will check probably on Tuesday, heading to a BBQ as it's a holiday
here. Also my laptop cooling fan broke a few days ago, got it patched up
temporarily though: An external fan duct taped to the side of the machine
until the replacement arrives :)
 
> Also note that this should only be used for comparing SMP vs UP versions
> of the same architecture - in other words, not ARMv6 vs ARMv6K.

Right, ARMv6 vs ARMv6K can be dealt with in another patch once this
is done.
 
> Lastly, what's happening about ARMv6 and ARMv7 processor setup functions?
> Are we going to split them into those which need SMP bits twiddled and
> those which don't?  If we are going to split them, someone needs to follow
> up on this email with patches to do it (preferably to be slotted in
> before these changes.)

No need to split them any longer AFAIK. Or do you have some case in mind
that's not being handled now, maybe I don't follow you?

Regards,

Tony