Re: Add prefetch switch stack hook in scheduler function

[Ingo Molnar <mingo@elte.hu>]

* linux@horizon.com <linux@horizon.com> wrote:

> I think this pretty clearly points out the need for some arch-generic 
> infrastructure in Linux.  An awful lot of arch hooks are for one or 
> two architectures with some peculiarities, and the other 90% of the 
> implementations are identical.
> 
> For example, this is 22 repetitions of
> #define MIN_KERNEL_STACK_FOOTPRINT L1_CACHE_BYTES
> 
> with one different case.

this just primes all the architectures so that they build. Every 
architecture should then adjust these parameters. Also, since the 
patches are not final yet i didnt try to widen them too much.

> It would be awfully nice if there was a standard way to provide a 
> default implementation that was automatically picked up by any 
> architecture that didn't explicitly override it.

that used to be the ARCH_HAS_* flags & macros - but these days we prefer 
clean inline functions defined per arch, no ifdefs.

If there is something that is truly shared between all arches then an 
asm-generic/*.h file can be generated for it, and included from most 
arches. I dont think the changes i did will necessiate that.

	Ingo