From mboxrd@z Thu Jan  1 00:00:00 1970
From: Will Deacon <will.deacon@arm.com>
Date: Wed, 27 Jan 2016 10:23:14 +0000
Subject: Re: [v3,11/41] mips: reuse asm-generic/barrier.h
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To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>, Peter Zijlstra <peterz@infradead.org>, "Michael S. Tsirkin" <mst@redhat.com>, linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>, linux-arch@vger.kernel.org, Andrew Cooper <andrew.cooper3@citrix.com>, Russell King - ARM Linux <linux@arm.linux.org.uk>, virtualization@lists.linux-foundation.org, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <hpa@zytor.com>, Joe Perches <joe@perches.com>, David Miller <davem@davemloft.net>, linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-metag@vger.kernel.org, linux-mips@linux-mips.org, x86@kernel.org, user-mode-linux-devel@lists.sourceforge.net, adi-buildroot-devel@lists.sourceforg

On Tue, Jan 26, 2016 at 03:37:33PM -0800, Paul E. McKenney wrote:
> On Tue, Jan 26, 2016 at 12:10:10PM +0000, Will Deacon wrote:
> > On Mon, Jan 25, 2016 at 05:06:46PM -0800, Paul E. McKenney wrote:
> > > PPC WRCnf+addrs
> > > ""
> > > {
> > > 0:r2=x; 0:r3=y;
> > > 1:r2=x; 1:r3=y;
> > > 2:r2=x; 2:r3=y;
> > > c=a; d=b; x=c; y=d;
> > > }
> > >  P0           | P1            | P2            ;
> > >  stw r3,0(r2) | lwz r8,0(r2)  | lwz r8,0(r3)  ;
> > >               | stw r2,0(r8)  | lwz r9,0(r8)  ;
> > > exists
> > > (1:r8=y /\ 2:r8=x /\ 2:r9=c)
> > 
> > Agreed.
> 
> OK, thank you!  Would you agree that it would be good to replace the
> current xor-based fake-dependency litmus tests with tests having real
> dependencies?

Yes, because it would look a lot more like real (kernel) code.

Will