[PATCH] ARM: smp: Introduce ARCH_HAS_COMMON_CORES_CLOCK to speed-up boot

[Rob Herring]

On 01/20/2011 03:42 AM, Santosh Shilimkar wrote:
> On some architectures, secondary cores shares clock with primiary
> core and hence scale together. Hence secondary core lpj calibration
> is not necessary and can be skipped to save considerable time.
>
> This can speed up the secondary cpu boot and hotplug cpu online
> paths.
>
> Discussion thread:
> 	http://www.spinics.net/lists/arm-kernel/msg111124.html
>

There's already one way to do this with pre-calculated lpj.

Also, this isn't multi-platform friendly. You could accomplish the same 
thing using the clock api to get the core frequency of each core and 
only calculate lpj if the frequency is different.

Rob