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Groups > linux.kernel > #1622844
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| From | Peter Zijlstra <peterz@infradead.org> |
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() |
| Date | Thu, 13 Apr 2017 11:20:02 +0200 |
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On Wed, Apr 12, 2017 at 09:55:43AM -0700, Paul E. McKenney wrote:
> However, a little future-proofing is a good thing,
> especially given that smp_mb__before_atomic() is only required to
> provide acquire semantics rather than full ordering. This commit
> therefore adds smp_mb__after_atomic() after the atomic_long_inc()
> in sync_exp_work_done().
Oh!? As far as I'm away the smp_mb__{before,after}_atomic() really must
provide full MB, no confusion about that.
We have other primitives for acquire/release.
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[PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Peter Zijlstra <peterz@infradead.org> - 2017-04-13 11:20 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Peter Zijlstra <peterz@infradead.org> - 2017-04-13 11:40 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 18:20 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Peter Zijlstra <peterz@infradead.org> - 2017-04-13 18:30 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:00 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Peter Zijlstra <peterz@infradead.org> - 2017-04-13 19:20 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:50 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Peter Zijlstra <peterz@infradead.org> - 2017-04-13 20:00 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Peter Zijlstra <peterz@infradead.org> - 2017-04-13 20:10 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-20 01:30 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-20 01:30 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Peter Zijlstra <peterz@infradead.org> - 2017-04-20 13:20 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-20 17:10 +0200
Re: [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Peter Zijlstra <peterz@infradead.org> - 2017-04-20 17:10 +0200
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