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Groups > linux.kernel > #1228179
| From | Will Deacon <will.deacon@arm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants |
| Date | 2015-09-18 19:00 +0200 |
| Message-ID | <qa7aW-8r0-33@gated-at.bofh.it> (permalink) |
| References | <q9nhM-vs-7@gated-at.bofh.it> <q9nhM-vs-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Sep 16, 2015 at 04:49:31PM +0100, Boqun Feng wrote:
> On powerpc, we don't need a general memory barrier to achieve acquire and
> release semantics, so __atomic_op_{acquire,release} can be implemented
> using "lwsync" and "isync".
I'm assuming isync+ctrl isn't transitive, so we need to get to the bottom
of the s390 thread you linked me to before we start spreading this
further:
https://lkml.org/lkml/2015/9/15/836
Will
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[RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants Boqun Feng <boqun.feng@gmail.com> - 2015-09-16 18:00 +0200
Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants Will Deacon <will.deacon@arm.com> - 2015-09-18 19:00 +0200
Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants Boqun Feng <boqun.feng@gmail.com> - 2015-09-19 17:40 +0200
Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants Boqun Feng <boqun.feng@gmail.com> - 2015-09-20 10:30 +0200
Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants Will Deacon <will.deacon@arm.com> - 2015-09-22 00:30 +0200
Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants Boqun Feng <boqun.feng@gmail.com> - 2015-09-22 01:30 +0200
Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants Boqun Feng <boqun.feng@gmail.com> - 2015-09-22 01:40 +0200
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