From: Peter Zijlstra <peterz@infradead.org>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
manfred@colorfullife.com, dave@stgolabs.net,
paulmck@linux.vnet.ibm.com, will.deacon@arm.com,
Waiman.Long@hpe.com, tj@kernel.org, pablo@netfilter.org,
kaber@trash.net, davem@davemloft.net, oleg@redhat.com,
netfilter-devel@vger.kernel.org, sasha.levin@oracle.com,
hofrat@osadl.org
Subject: Re: [PATCH -v3 3/8] locking: Introduce smp_acquire__after_ctrl_dep
Date: Wed, 1 Jun 2016 18:22:55 +0200 [thread overview]
Message-ID: <20160601162255.GT3190@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160601135214.GC30064@insomnia>
On Wed, Jun 01, 2016 at 09:52:14PM +0800, Boqun Feng wrote:
> On Tue, May 31, 2016 at 11:41:37AM +0200, Peter Zijlstra wrote:
> > @@ -292,7 +282,7 @@ static void sem_wait_array(struct sem_ar
> > sem = sma->sem_base + i;
> > spin_unlock_wait(&sem->lock);
> > }
> > - ipc_smp_acquire__after_spin_is_unlocked();
> > + smp_acquire__after_ctrl_dep();
>
> I wonder whether we can kill this barrier after updating
> spin_unlock_wait() to ACQUIRE?
See patch 5 doing that :-)
next prev parent reply other threads:[~2016-06-01 16:23 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-31 9:41 [PATCH -v3 0/8] spin_unlock_wait borkage and assorted bits Peter Zijlstra
2016-05-31 9:41 ` [PATCH -v3 1/8] locking: Replace smp_cond_acquire with smp_cond_load_acquire Peter Zijlstra
2016-05-31 9:41 ` [PATCH -v3 2/8] locking: Introduce cmpwait() Peter Zijlstra
2016-05-31 9:41 ` [PATCH -v3 3/8] locking: Introduce smp_acquire__after_ctrl_dep Peter Zijlstra
2016-06-01 13:52 ` Boqun Feng
2016-06-01 16:22 ` Peter Zijlstra [this message]
2016-06-01 23:19 ` Boqun Feng
2016-05-31 9:41 ` [PATCH -v3 4/8] locking, arch: Update spin_unlock_wait() Peter Zijlstra
2016-06-01 11:24 ` Will Deacon
2016-06-01 11:37 ` Peter Zijlstra
2016-05-31 9:41 ` [PATCH -v3 5/8] locking: Update spin_unlock_wait users Peter Zijlstra
2016-05-31 9:41 ` [PATCH -v3 6/8] locking,netfilter: Fix nf_conntrack_lock() Peter Zijlstra
2016-05-31 9:41 ` [PATCH -v3 7/8] locking: Move smp_cond_load_acquire() and friends into asm-generic/barrier.h Peter Zijlstra
2016-05-31 20:01 ` Waiman Long
2016-06-01 9:31 ` Peter Zijlstra
2016-06-01 12:00 ` Will Deacon
2016-06-01 12:06 ` Peter Zijlstra
2016-06-01 12:13 ` Will Deacon
2016-06-01 12:45 ` Peter Zijlstra
2016-06-01 14:07 ` Will Deacon
2016-06-01 17:13 ` Peter Zijlstra
2016-06-01 16:53 ` Waiman Long
2016-05-31 9:41 ` [PATCH -v3 8/8] locking, tile: Provide TILE specific smp_acquire__after_ctrl_dep Peter Zijlstra
2016-05-31 15:32 ` Chris Metcalf
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