Re: [RFC 00/15] x86_64: Optimize percpu accesses

[H. Peter Anvin]

Mike Travis wrote:
> H. Peter Anvin wrote:
> > Hi Mike,
> >
> > Did the suspected linker bug issue ever get resolved?
> >
> >     -hpa
>
> Hi Peter,
>
> I was not able to figure out how the two versions of the same
> kernel compiled by gcc-4.2.0 and gcc-4.2.4 differed.   Currently,
> I'm sticking with gcc-4.2.4 as it boots much farther.
>
> There still is a problem where if I bump THREAD_ORDER, the
> problem goes away and everything so far that I've tested boots
> up fine.
>
> We tried to install a later gcc (4.3.1) that might have the
> "GCC_HAS_SP" flag but our sys admin reported:
>
> 	The 4.3.1 version gives me errors on the make.  I had to
> 	pre-install gmp and mpfr, but, I still get errors on the make.
>
> I think that was the latest he found on the GNU/GCC site.

We have seen miscompilations with gcc 4.3.0 at least; not sure about 4.3.1.

	-hpa

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