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Groups > linux.kernel > #1237583
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants |
| Date | 2015-10-01 19:20 +0200 |
| Message-ID | <qePGq-2Bk-27@gated-at.bofh.it> (permalink) |
| References | <q9nhM-vs-7@gated-at.bofh.it> <q9nhN-vs-19@gated-at.bofh.it> <qeL9N-3Vj-25@gated-at.bofh.it> <qeNEC-8aM-17@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Oct 01, 2015 at 08:09:09AM -0700, Paul E. McKenney wrote: > On Thu, Oct 01, 2015 at 02:24:40PM +0200, Peter Zijlstra wrote: > > I must say I'm somewhat surprised by this level of relaxation, I had > > expected to only loose SMP barriers, not the program order ones. > > > > Is there a good argument for this? > > Yes, when we say "relaxed", we really mean relaxed. ;-) > > Both the CPU and the compiler are allowed to reorder around relaxed > operations. Is this documented somewhere, because I completely missed this part. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants Peter Zijlstra <peterz@infradead.org> - 2015-10-01 14:30 +0200
Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-01 17:10 +0200
Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants Peter Zijlstra <peterz@infradead.org> - 2015-10-01 19:20 +0200
Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-01 20:10 +0200
Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants Peter Zijlstra <peterz@infradead.org> - 2015-10-01 20:30 +0200
Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-01 21:50 +0200
Re: [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants Will Deacon <will.deacon@arm.com> - 2015-10-05 16:50 +0200
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