Messages in this thread | | | Date | Sat, 29 Sep 2007 12:12:52 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [rfc][patch] i386: remove comment about barriers |
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On Sat, 29 Sep 2007, Nick Piggin wrote:
> [ This is true for x86's sfence/lfence, but raises a question about Linux's > memory barriers. Does anybody expect that a sequence of smp_wmb and smp_rmb > would ever provide a full smp_mb barrier? I've always assumed no, but I > don't know if it is actually documented? ]
No, that can't be. rmb+wmb can't be considered a full mb. There was a recent discussion about this in the thread originated by peterz scalable rw_mutex patches.
- Davide
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