linux-kernel - Re: [RFC][PATCH 15/24] powerpc: Provide atomic

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Date:	Fri, 10 Jul 2015 07:49:20 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	rth@...ddle.net, vgupta@...opsys.com, linux@....linux.org.uk,
	will.deacon@....com, hskinnemoen@...il.com, realmz6@...il.com,
	dhowells@...hat.com, rkuo@...eaurora.org, tony.luck@...el.com,
	geert@...ux-m68k.org, james.hogan@...tec.com, ralf@...ux-mips.org,
	jejb@...isc-linux.org, heiko.carstens@...ibm.com,
	davem@...emloft.net, cmetcalf@...hip.com, mingo@...nel.org
Subject: Re: [RFC][PATCH 15/24] powerpc: Provide atomic_{or,xor,and}

On Thu, 2015-07-09 at 19:29 +0200, Peter Zijlstra wrote:
> Implement atomic logic ops -- atomic_{or,xor,and}.
> 
> These will replace the atomic_{set,clear}_mask functions that are
> available on some archs.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/powerpc/include/asm/atomic.h |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> --- a/arch/powerpc/include/asm/atomic.h
> +++ b/arch/powerpc/include/asm/atomic.h
> @@ -66,6 +66,9 @@ static __inline__ int atomic_##op##_retu
>  
>  ATOMIC_OPS(add, add)
>  ATOMIC_OPS(sub, subf)
> +ATOMIC_OP(and, and)
> +ATOMIC_OP(or, or)
> +ATOMIC_OP(xor, xor)
>  
>  #undef ATOMIC_OPS
>  #undef ATOMIC_OP_RETURN
> @@ -304,6 +307,9 @@ static __inline__ long atomic64_##op##_r
>  
>  ATOMIC64_OPS(add, add)
>  ATOMIC64_OPS(sub, subf)
> +ATOMIC64_OP(and, and)
> +ATOMIC64_OP(or, or)
> +ATOMIC64_OP(xor, xor)

As long as you are ok that they are non-ordered atomics (no barrier in
them), then

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

>  #undef ATOMIC64_OPS
>  #undef ATOMIC64_OP_RETURN
> 
> 
> --
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