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SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses
Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
>> Did the suspected linker bug issue ever get resolved?
>
> I don't believe so. I think Mike is getting very early crashes
> depending on some combination of gcc, linker and kernel config. Or
> something.

Yes and unfortunately since SGI does not do it's own compilers any
more (they were MIPS compilers), there's no one here that really
understands the internals of the compile tools.

>
> This fragility makes me very nervous. It seems hard enough to get this
> stuff working with current tools; making it work over the whole range of
> supported tools looks like its going to be hard.

(me too ;-)

Once I get a solid version working with (at least) gcc-4.2.4, then
regression testing with older tools will be easier, or at least a
table of results can be produced.

Thanks,
Mike



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