Re: [patch 134/149] x86, paravirt: Add a global synchronization point for pvclock

H.J. Lu
2010-07-14T19:32:45Z

On Wed, Jul 14, 2010 at 12:00 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> On 07/14/2010 11:18 AM, H.J. Lu wrote:
>>
>> There are some discussions on:
>>
>> http://gcc.gnu.org/ml/gcc-patches/2010-06/msg02001.html
>> http://gcc.gnu.org/ml/gcc-patches/2010-07/msg00001.html
>>
>> Are they related?
>>
>
> Not directly as far as I can tell.
>
> The issue is if gcc can ever reorder, duplicate or elide a volatile
> operation (either asm volatile or a volatile-annotated memory
> reference.)  In my (and Linus') opinion, this would be an incredibly
> serious bug.
>
>

Is there a gcc bug for this?

--
H.J.