gcc 4.5.1 / as 2.20.51.0.11 miscompiling drivers/char/i8k.c ?

[Andi Kleen]

> testcase shows that in 4.1/4.2/4.3/4.4 this is miscompiled only when using
> -fno-ipa-reference, in 4.5 it is miscompiled always when optimizing
> unless -fno-ipa-pure-const (as 4.5 added local-pure-const pass which is run
> before ipa-reference) and in 4.6 this has been fixed by Honza when
> doing ipa cleanups.

Maybe it would be better to simply change the kernel Makefiles to pass
-fno-ipa-pure-const instead of adding volatiles everywhere.

-Andi