linux-kernel - Re: [PATCH -v2 22/33] locking,sparc: Implement atomic{,64}_fetch

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Message-Id: <20160531.105057.1994007943543248986.davem@davemloft.net>
Date:	Tue, 31 May 2016 10:50:57 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	peterz@...radead.org
Cc:	torvalds@...ux-foundation.org, mingo@...nel.org,
	tglx@...utronix.de, will.deacon@....com,
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Subject: Re: [PATCH -v2 22/33] locking,sparc: Implement
 atomic{,64}_fetch_{add,sub,and,or,xor}()

From: Peter Zijlstra <peterz@...radead.org>
Date: Tue, 31 May 2016 12:19:47 +0200

> Implement FETCH-OP atomic primitives, these are very similar to the
> existing OP-RETURN primitives we already have, except they return the
> value of the atomic variable _before_ modification.
> 
> This is especially useful for irreversible operations -- such as
> bitops (because it becomes impossible to reconstruct the state prior
> to modification).
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Acked-by: David S. Miller <davem@...emloft.net>