linux-kernel - Re: [PATCH v3 0/6] atomics: powerpc: Implement relaxed/acquire/release variants of some atomics

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Message-ID: <20151013154628.GQ3910@linux.vnet.ibm.com>
Date:	Tue, 13 Oct 2015 08:46:29 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, Ingo Molnar <mingo@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will.deacon@....com>,
	Waiman Long <waiman.long@...com>,
	Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [PATCH v3 0/6] atomics: powerpc: Implement
 relaxed/acquire/release variants of some atomics

On Tue, Oct 13, 2015 at 02:27:13PM +0200, Peter Zijlstra wrote:
> On Mon, Oct 12, 2015 at 10:14:00PM +0800, Boqun Feng wrote:
> 
> > The patchset consists of 6 parts:
> > 
> > 1.	Make xchg, cmpxchg and their atomic_ versions a full barrier
> > 
> > 2.	Add trivial tests for the new variants in lib/atomic64_test.c
> > 
> > 3.	Allow architectures to define their own __atomic_op_*() helpers
> > 	to build other variants based on relaxed.
> > 
> > 4.	Implement atomic{,64}_{add,sub,inc,dec}_return_* variants
> > 
> > 5.	Implement xchg_* and atomic{,64}_xchg_* variants
> > 
> > 6.	Implement cmpxchg_* atomic{,64}_cmpxchg_* variants
> > 
> > 
> > This patchset is based on current locking/core branch of the tip tree
> > and all patches are built and boot tested for little endian pseries, and
> > also tested by 0day.
> 
> I don't see any immediate problems with this series at this point. Will,
> Paul?

Every time I have gotten ready to take a close look, someone has pointed
out a problem, and I have deferred until the next version.  Looks like
I should take a close look at Boqun's next version regardless.  ;-)

							Thanx, Paul

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