Re: [PATCH] percpu data: only iterate over possible CPUs

[Dipankar Sarma <dipankar@in.ibm.com>]

On Tue, Feb 07, 2006 at 10:43:55AM -0800, Linus Torvalds wrote:
> 
> 
> On Wed, 8 Feb 2006, Dipankar Sarma wrote:
> > 
> > One would think so, but I recall not all archs did that. Alpha for
> > example sets up cpu_possible_map in smp_prepare_cpus(). It however
> > makes more sense to fix the arch then use NR_CPUS, IMO.
> 
> Ehh? alpha does it in setup_smp(), which in turn is called very early from 
> setup_arch().
> 
> Were you perhaps thinking of something else? Or am I just going blind and 
> confused?

I am looking at 2.6.16-rc1 and I don't see cpu_possible_map
being set in setup_smp(). That said, it seems alpha setup_smp()
probes for cpus there, so there is no reason why it cannot
be set there. I think it is wrong not to set cpu_possible_map
very early.

Or perhaps it got fixed later on, in which case, oh well, I need
to download more often. <sigh>.

Thanks
Dipankar