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

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Message-ID: <18907.14029.301492.493938@cargo.ozlabs.ibm.com>
Date:	Tue, 7 Apr 2009 21:19:41 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] x86, perfcounters: add atomic64_xchg()

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?

Paul.
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