Re: [PATCH] 2.6 workaround for Athlon/Opteron prefetch errata

[Jeff Garzik]

Andi Kleen wrote:
> On Thu, 11 Sep 2003 10:34:36 -0400
> Jeff Garzik <jgarzik@xxxxxxxxx> wrote:
>
>
> > > X86_GENERIC is merely an optimization hint (currently it only changes the cache
> > > line size hint) It does not change anything related to correctness. Everything
> > > that handles correctness is checked unconditionally.
> >
> > When, building non-Pentium4-related code when CONFIG_MPENTIUM4 && 
> > !CONFIG_X86_GENERIC, it's OK that the code is incorrect for (picking 
> > example) AMD processors.
>
>
> No 2.6 changed that. On 2.6 you can exchange the kernels.
>
> [that was mainly done for distributions, but helps other users too]


If distributions are not building with CONFIG_X86_GENERIC, then they're 
broken.  So it was rather pointless for 2.6 to "change that."

Luckily, CONFIG_X86_GENERIC allows us the opportunity to be _less_ 
generic when it's not defined, regardless of what you originally 
intended ;-)

	Jeff



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