"David Laight" <david.lai...@aculab.com> wrote on 10/31/2013 02:28:56 PM:
> So even though the wmb() in the writer ensures the writes are correctly > ordered, the reader can read the old value from the second location from > its local cache. In case of circular buffer, the only thing that producer reads is @tail, and nothing wrong will happen if producer reads old value of @tail. Moreover, adherents of smp_mb() insert it *after* the read of @tail, so it cannot prevent reading of old value anyway. -- Victor _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
