linux-kernel - Re: [PATCH v2] barriers: introduce smp_mb__release

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Message-ID: <20151009174418.GW3910@linux.vnet.ibm.com>
Date:	Fri, 9 Oct 2015 10:44:18 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Will Deacon <will.deacon@....com>,
	Michael Ellerman <mpe@...erman.id.au>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Boqun Feng <boqun.feng@...il.com>,
	Anton Blanchard <anton@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2] barriers: introduce smp_mb__release_acquire and
 update documentation

On Fri, Oct 09, 2015 at 01:25:54PM +0200, Peter Zijlstra wrote:
> On Fri, Oct 09, 2015 at 10:51:29AM +0100, Will Deacon wrote:
> > > The corresponding litmus tests are below.
> > 
> > How do people feel about including these in memory-barriers.txt? I find
> > them considerably easier to read than our current kernel code + list of
> > possible orderings + wall of text, but there's a good chance that my
> > brain has been corrupted from staring at this stuff for too long.
> 
> Your brain is corrupt (but then, so probably is mine, just differently
> so).
> 
> I've not yet mastered the knack of reading those things; then again, I
> suspect its not too hard, just not something I've had the time to play
> with.

It does take a bit of practice, but is worth the effort.  Of course,
I -would- say that.  ;-)

							Thanx, Paul

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