linux-kernel - Re: [tip:perfcounters/core] x86, perfcounters: add atomic64

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Message-ID: <20090407132825.GB30984@elte.hu>
Date:	Tue, 7 Apr 2009 15:28:25 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] x86, perfcounters: add atomic64_xchg()


* Paul Mackerras <paulus@...ba.org> wrote:

> Ingo Molnar writes:
> 
> > Complete atomic64_t support on the 32-bit side by adding atomic64_xch().
> > 
> > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > LKML-Reference: <20090406094518.445450972@...llo.nl>
> > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> > 
> > 
> > ---
> >  arch/x86/include/asm/atomic_32.h |    6 ++++++
> >  1 files changed, 6 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/x86/include/asm/atomic_32.h b/arch/x86/include/asm/atomic_32.h
> > index 977250e..a9fef6c 100644
> > --- a/arch/x86/include/asm/atomic_32.h
> > +++ b/arch/x86/include/asm/atomic_32.h
> > @@ -306,6 +306,12 @@ static inline void atomic64_set(atomic64_t *ptr, unsigned long long new_val)
> >  	} while (atomic64_cmpxchg(ptr, old_val, new_val) != old_val);
> >  }
> >  
> > +static inline void
> > +atomic64_xchg(atomic64_t *ptr, unsigned long long new_val)
> > +{
> > +	atomic64_set(ptr, new_val);
> > +}
> 
> Umm, I don't know much about x86, but that doesn't look like an 
> exchange operation to me...  Shouldn't it return a value, for a 
> start?

Yes, indeed :) Fixed it.

/me officially loves commit notifications

	Ingo
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