linux-kernel - Re: [RFC v2 1/7] atomics: Add test for atomic operations with

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Date:	Mon, 12 Oct 2015 10:30:34 +0100
From:	Will Deacon <will.deacon@....com>
To:	Boqun Feng <boqun.feng@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Waiman Long <waiman.long@...com>
Subject: Re: [RFC v2 1/7] atomics: Add test for atomic operations with
 _relaxed variants

On Wed, Sep 16, 2015 at 04:49:29PM +0100, Boqun Feng wrote:
> Some atomic operations now have _{relaxed, acquire, release} variants,
> this patch then adds some trivial tests for two purpose:
> 
> 1.	test the behavior of these new operations in single-CPU
> 	environment.
> 2.	make their code generated before we actually use them somewhere,
> 	so that we can examine their assembly code.
> 
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> ---
>  lib/atomic64_test.c | 91 ++++++++++++++++++++++++++++++++++-------------------
>  1 file changed, 59 insertions(+), 32 deletions(-)

FWIW: this was useful to me whilst developing the arm64 relaxed atomic
implementation. Could you extend it to include the recently queued inc/dec
variants too?

Will
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