[PATCH] arm: fix handling of nr_cpus

[Russell King - ARM Linux]

On Tue, Oct 11, 2011 at 09:31:04AM -0400, Mark Salter wrote:
> The current code duplicates the setup of the cpu_possible bitmap in the
> platform smp_init_cpus() function. Unfortunately, all of those places
> have the same bug where the nr_cpus kernel parameter is ignored. This patch
> consolidates the duplicated code in one place and fixes it to honor the
> nr_cpus parameter. This is accomplished by having smp_init_cpus() return
> the platform specific number of cores so that the caller (setup_arch) can
> set up the cpu_possible bitmap correctly for all platforms.

Who says every platform we're going to see will always have CPUs 0..N ?
It's entirely possible that someone might want to have CPUs 0, 2, 3 as
possible CPUs but omit CPU1 for platform reasons.