[PATCH] lib: Consolidate DEBUG_STACK_USAGE option

[Benjamin Herrenschmidt]

On Fri, 2011-05-06 at 22:57 -0700, Stephen Boyd wrote:
> Most arches define CONFIG_DEBUG_STACK_USAGE exactly the same way.
> Move it to lib/Kconfig.debug so each arch doesn't have to define
> it. This obviously makes the option generic, but that's fine
> because the config is already used in generic code.
> 
> It's not obvious to me that sysrq-P actually does anything
> different with this option enabled, but I erred on the side of
> caution by keeping the most inclusive wording.

Sorry for the delay...

For powerpc:

Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>

Cheers,
Ben.