From: Will Deacon <will.deacon@arm.com>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Waiman Long <waiman.long@hp.com>
Subject: Re: [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants
Date: Fri, 18 Sep 2015 17:59:02 +0100 [thread overview]
Message-ID: <20150918165902.GF12837@arm.com> (raw)
In-Reply-To: <1442418575-12297-4-git-send-email-boqun.feng@gmail.com>
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
next prev parent reply other threads:[~2015-09-18 16:59 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-16 15:49 [RFC v2 0/7] atomics: powerpc: Implement relaxed/acquire/release variants of some atomics Boqun Feng
2015-09-16 15:49 ` [RFC v2 1/7] atomics: Add test for atomic operations with _relaxed variants Boqun Feng
2015-10-12 9:30 ` Will Deacon
2015-10-12 9:38 ` Boqun Feng
2015-09-16 15:49 ` [RFC v2 2/7] atomics: Allow architectures to define their own __atomic_op_* helpers Boqun Feng
2015-09-16 15:49 ` [RFC v2 3/7] powerpc: atomic: Implement atomic{, 64}_{add, sub}_return_* variants Boqun Feng
2015-09-18 16:59 ` Will Deacon [this message]
2015-09-19 15:33 ` [RFC v2 3/7] powerpc: atomic: Implement atomic{,64}_{add,sub}_return_* variants Boqun Feng
2015-09-20 8:23 ` Boqun Feng
2015-09-21 22:24 ` Will Deacon
2015-09-21 23:26 ` Boqun Feng
2015-09-21 23:37 ` Boqun Feng
2015-09-22 15:25 ` Paul E. McKenney
2015-09-23 0:07 ` Boqun Feng
2015-09-25 21:29 ` Paul E. McKenney
2015-09-26 2:18 ` Boqun Feng
2015-09-16 15:49 ` [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{, 64}_xchg_* variants Boqun Feng
2015-10-01 12:24 ` [RFC v2 4/7] powerpc: atomic: Implement xchg_* and atomic{,64}_xchg_* variants Peter Zijlstra
2015-10-01 15:09 ` Paul E. McKenney
2015-10-01 17:13 ` Peter Zijlstra
2015-10-01 18:03 ` Paul E. McKenney
2015-10-01 18:23 ` Peter Zijlstra
2015-10-01 19:41 ` Paul E. McKenney
2015-10-05 14:44 ` Will Deacon
2015-10-05 16:57 ` Paul E. McKenney
2015-10-12 1:17 ` Boqun Feng
2015-10-12 9:28 ` Will Deacon
2015-10-12 23:24 ` Paul E. McKenney
2015-09-16 15:49 ` [RFC v2 5/7] powerpc: atomic: Implement cmpxchg{, 64}_* and atomic{, 64}_cmpxchg_* variants Boqun Feng
2015-10-01 12:27 ` [RFC v2 5/7] powerpc: atomic: Implement cmpxchg{,64}_* and atomic{,64}_cmpxchg_* variants Peter Zijlstra
2015-10-01 12:36 ` Peter Zijlstra
2015-10-01 15:12 ` Paul E. McKenney
2015-10-01 17:11 ` Peter Zijlstra
2015-10-01 15:13 ` Paul E. McKenney
2015-10-10 1:58 ` Boqun Feng
2015-10-11 10:25 ` Boqun Feng
2015-10-12 6:46 ` Peter Zijlstra
2015-10-12 7:03 ` Boqun Feng
2015-09-16 15:49 ` [RFC v2 6/7] powerpc: atomic: Make atomic{, 64}_xchg and xchg a full barrier Boqun Feng
2015-10-01 12:28 ` [RFC v2 6/7] powerpc: atomic: Make atomic{,64}_xchg " Peter Zijlstra
2015-10-01 23:19 ` Boqun Feng
2015-10-02 5:25 ` Peter Zijlstra
2015-09-16 15:49 ` [RFC v2 7/7] powerpc: atomic: Make atomic{, 64}_cmpxchg and cmpxchg " Boqun Feng
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