Arjan van de Ven wrote:
quoted text
> On Tue, 02 Oct 2007 18:08:32 +0400
> Kirill Korotaev <dev@openvz.org> wrote:
> 
>> Some gcc versions (I checked at least 4.1.1 from RHEL5 & 4.1.2 from
>> gentoo) can generate incorrect code with read_crX()/write_crX()
>> functions mix up, due to cached results of read_crX().
>>
> 
> I'm not so sure volatile is the right answer, as compared to giving the
> asm more strict contraints....
> 
> asm volatile tends to mean something else than "the result has
> changed"....
> 

One of the aspect of volatility is "the result will change in ways you 
(gcc) just don't understand."

	-hpa
-
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/