Messages in this thread | | | From | Cameron <> | Date | Thu, 27 Aug 2020 15:57:22 -0400 | Subject | Re: [RFC][PATCH 6/7] freelist: Lock less freelist |
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On Thu, Aug 27, 2020 at 3:08 PM Boqun Feng <boqun.feng@gmail.com> wrote: > So if try_cmpxchg_acquire() fails, we don't have ACQUIRE semantics on > read of the new list->head, right? Then probably a > smp_mb__after_atomic() is needed in that case?
Yes, there needs to be an acquire on the head after a failed cmpxchg; does the atomic_fetch_add following that not have acquire semantics?
Cameron
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