linux-kernel - Re: [RFC][PATCH 02/24] arc: Provide atomic

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Date:	Fri, 10 Jul 2015 04:30:46 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
CC:	"rth@...ddle.net" <rth@...ddle.net>,
	"Vineet.Gupta1@...opsys.com" <Vineet.Gupta1@...opsys.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"will.deacon@....com" <will.deacon@....com>,
	"hskinnemoen@...il.com" <hskinnemoen@...il.com>,
	"realmz6@...il.com" <realmz6@...il.com>,
	"dhowells@...hat.com" <dhowells@...hat.com>,
	"rkuo@...eaurora.org" <rkuo@...eaurora.org>,
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	"cmetcalf@...hip.com" <cmetcalf@...hip.com>,
	"mingo@...nel.org" <mingo@...nel.org>
Subject: Re: [RFC][PATCH 02/24] arc: Provide atomic_{or,xor,and}

On Thursday 09 July 2015 11:26 PM, 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>

Acked-by: Vineet Gupta <vgupta@...opsys.com>

Since we are on the topic, the cmpxchg() loop in arch/arc/kernel/smp.c still
irritates me.
Do we need a new set of primitives to operate atomically on non atomic_t data or
does that mean that the data *not* being atomic_t but requiring such semantics is
the fundamental problem and thus needs to be converted first.

-Vineet


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