Messages in this thread | | | Date | Wed, 6 Jul 2016 14:33:29 +0900 | From | Byungchul Park <> | Subject | Re: [PATCH] lockdep: Add a document describing crossrelease feature |
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On Wed, Jul 06, 2016 at 11:17:10AM +0900, Byungchul Park wrote: > > lock(A) > wait_for(B) > ~~~~~~~~~~~~~~~~~~~~~~~~ <- serialized by atomic operation > lock(A) > unlock(A) > wake(B) > unlock(A)
By the way, I have a question. Is there anyone who could answer it?
I want to serialize between two context's lock operations, for example,
context A context B -------------- -------------- lock A lock B ... lock C atomic_inc_return ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <- serialization atomic_read lock D ... lock E lock F
so that we can see these in the order like A -> B -> C -> D -> E -> F.
atomic_inc_return() is used after lock C in context A, and atomic_read() is used before lock D in context B. And I want to make it serialized when the atomic_read() can see the increased value.
Can I use smp_mb__after_atomic() just after atomic_read() or should I use smp_mb()? I think anyway I have to choose one of them for that ordering.
Thank you, Byungchul
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