[uml-devel] arch/i386/Kconfig.cpu considered harmful

[uml-devel] arch/i386/Kconfig.cpu considered harmful

[Jeff Dike]

Do we really need to pull that into the UML Kconfig?  We need some of
the things it defines, like X86_CMPXCHG, but people keep discovering
that menu and trying to set it to match the host, causing compilation
problems when that pulls in headers that UML doesn't have.

I think I would like to dump Kconfig.cpu and define for ourselves the
symbols that we need.

				Jeff


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[uml-devel] Re: arch/i386/Kconfig.cpu considered harmful

[Blaisorblade]

On Wednesday 03 May 2006 16:42, Jeff Dike wrote:
> Do we really need to pull that into the UML Kconfig?  We need some of
> the things it defines, like X86_CMPXCHG, but people keep discovering
> that menu and trying to set it to match the host, causing compilation
> problems when that pulls in headers that UML doesn't have.

Yes, I didn't fix these problems. I've been fairly lazy, I must admit this.

> I think I would like to dump Kconfig.cpu and define for ourselves the
> symbols that we need.

How do you let the user choose the CPU he wants to optimize for? That was the 
first purpose of what I did - optimizing for 386 isn't exactly the best thing 
to do (and we've done this, till the menu was introduced).

We can restrict the choices in the menu, for now, with a dependency on ! UML 
for the ones which don't work (i.e. the ones using 3DNow in string 
operations, IIRC). M686, Athlon and likely Pentium 4 work at least.
-- 
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