Hello,

On Mon, Jul 08, 2013 at 10:18:08PM +0530, Viresh Kumar wrote:

On 8 July 2013 21:27, Uwe Kleine-König [off-list ref] wrote:

quoted

On Mon, Jul 08, 2013 at 09:17:01PM +0530, Viresh Kumar wrote:

quoted

quoted

Well, big LITTLE still runs an SMP kernel :) and so has this flag set.

The 'S' is justified because cpu0 and cpu1 are of the same type? Are
there b.L systems that have only one big and one LITTLE cpu? Do these
use SMP, too?

Following definition of SMP says:
http://en.wikipedia.org/wiki/Symmetric_Multiprocessor

A system is SMP when:
- It has same type of cores
- controlled by a single instance of OS.

In big LITTLE first one is obviously not completely true as you pointed out.
But second one is and so I would say its an SMP system :)

Don't know how it should be called though.

MP maybe.

quoted

quoted

You can make it dependent on that if required.

Well, it's not required. It's just that the corresponding question in
make oldconfig isn't really an enrichment for a kernel targeting an
Cortex M3 :-)

Just to make it clear enough, you are saying it doesn't make any
sense to enable it for M3? But because it is disabled by default,
the problem is not seen?

No I'm saying that asking me is bad because on an UP machine it won't
matter what I answer. So please don't ask me if SMP is off.

Why? Can't we have two M3's on a SoC and run an SMP kernel over
it?

Yeah, you can. Then you'd have SMP (or MP) enabled though and the choice
for that workqueue thing makes a difference. In that case asking is OK.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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