linux-kernel - Re: [PATCH v3 08/25] openrisc: add cmpxchg and xchg implementations

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Message-ID: <20170222142007.GB2449@lianli.shorne-pla.net>
Date:   Wed, 22 Feb 2017 23:20:07 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        linux@...ck-us.net, openrisc@...ts.librecores.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/25] openrisc: add cmpxchg and xchg implementations

On Wed, Feb 22, 2017 at 12:19:40PM +0100, Peter Zijlstra wrote:
> On Wed, Feb 22, 2017 at 04:11:37AM +0900, Stafford Horne wrote:
> > +	__asm__ __volatile__(
> > +		"1:	l.lwa %0, 0(%1)		\n"
> > +		"	l.sfeq %0, %2		\n"
> > +		"	l.bnf 1f		\n"
> > +		"	 l.nop			\n"
> > +		"	l.swa 0(%1), %3		\n"
> > +		"	l.bnf 1b		\n"
> > +		"1:	 l.nop			\n"
> > +		: "=&r"(old)
> > +		: "r"(ptr), "r"(old), "r"(new)
> > +		: "cc", "memory");
> 
> I just noticed this, but having both labels have the same name is
> somewhat confusing.

Right, better to use '2' for the second one.