[PATCH] PPC/PPC64: Introduce CPU_HAS_FEATURE() macro
benh at kernel.crashing.org
Sat Feb 5 10:50:44 EST 2005
On Fri, 2005-02-04 at 12:35 -0600, Olof Johansson wrote:
> On Fri, Feb 04, 2005 at 01:36:55PM +0100, Arnd Bergmann wrote:
> > I have a somewhat similar patch that does the same to the
> > systemcfg->platform checks. I'm not sure if we should use the same inline
> > function for both checks, but I do think that they should be used in a
> > similar way, e.g. CPU_HAS_FEATURE(x) and PLATFORM_HAS_FEATURE(x).
> Yep. Firmware features are also on the list. I figured I'd do CPU features
> first though since they are the ones that started bugging me.
> > The same stuff is obviously possible for cur_cpu_spec->cpu_features as well.
> > Do you think that it will help there?
> Nice. It won't be quite as easy to do compile-time for cpu features.
> pSeries will need all cpus enabled since we have them all on various
> machines, etc. I guess Powermac/Maple could benefit from it. In the
> end it depends on how hairy the implementation would get vs performance
One other thing we did on ppc32 was to have separate ELF sections for
pmac, chrp and prep specific code & get rid of them after boot... It may
be worth bringing this back in...
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