linux-kernel - Re: [PATCH 1/5] Add a global synchronization point for pvclock

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Date:	Mon, 19 Apr 2010 14:10:54 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Glauber Costa <glommer@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>
Subject: Re: [PATCH 1/5] Add a global synchronization point for pvclock

On 04/19/2010 02:05 PM, Peter Zijlstra wrote:
>>
>>> ACCESS_ONCE() is your friend.
>>>
>>>        
>> I think it's implied with atomic64_read().
>>      
> Yes it would be. I was merely trying to point out that
>
>    last = ACCESS_ONCE(last_value);
>
> Is a narrower way of writing:
>
>    last = last_value;
>    barrier();
>
> In that it need not clobber all memory locations and makes it instantly
> clear what we want the barrier for.
>    

Oh yes, just trying to avoid a patch with both atomic64_read() and 
ACCESS_ONCE().



-- 
error compiling committee.c: too many arguments to function

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