On 08/08/2017 21:14, Dr. David Alan Gilbert wrote:
>> There is no barrier there that I can see.  I know that it probably work
>> on x86, but in others?  I think that it *** HERE **** we need that
>> memory barrier that we don't have.
> Yes, I think that's smp_mb_release() - and you have to do an
> smp_mb_acquire after reading the pages->num before accessing the iov.

Yes, I think that's correct.


> (Probably worth checking with Paolo).
> Or just stick with mutex's.

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