linux-kernel - Re: [RFC][PATCH 18/31] locking,powerpc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}{,_relaxed,_acquire,

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Message-ID: <20160423023113.GY3430@twins.programming.kicks-ass.net>
Date:	Sat, 23 Apr 2016 04:31:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Boqun Feng <boqun.feng@...il.com>
Cc:	torvalds@...ux-foundation.org, mingo@...nel.org,
	tglx@...utronix.de, will.deacon@....com,
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Subject: Re: [RFC][PATCH 18/31] locking,powerpc: Implement
 atomic{,64}_fetch_{add,sub,and,or,xor}{,_relaxed,_acquire,_release}()

On Sat, Apr 23, 2016 at 12:41:57AM +0800, Boqun Feng wrote:
> > +#define ATOMIC_FETCH_OP_RELAXED(op, asm_op)				\
> > +static inline int atomic_fetch_##op##_relaxed(int a, atomic_t *v)	\
> > +{									\
> > +	int res, t;							\
> > +									\
> > +	__asm__ __volatile__(						\
> > +"1:	lwarx	%0,0,%4		# atomic_fetch_" #op "_relaxed\n"	\
> > +	#asm_op " %1,%2,%0\n"						\
> 
> Should be
> 
> 	#asm_op " %1,%3,%0\n"
> 
> right? Because %2 is v->counter and %3 is @a.

Indeed, thanks!