linux-kernel - Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"

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Message-ID: <4DD70120.9090801@kernel.org>
Date:	Fri, 20 May 2011 17:02:40 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	paulmck@...ux.vnet.ibm.com
CC:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based
 on semi-formal proof"

On 05/20/2011 04:49 PM, Paul E. McKenney wrote:
> On Fri, May 20, 2011 at 04:16:28PM -0700, Yinghai Lu wrote:
...
>>
>> the same one i sent out before, but let DEBUG_LOCKING_API_SELFTESTS disabled.
> 
> OK, just to make sure I understand...  You are compiling exactly the
> same kernel source tree with exactly the same .config, just with two
> different versions of gcc, correct?
yes.
> 
> If so, it is quite possible that the slow one is the correct one.  :-/
yeah, new version always have problem.

looks like opensuse11.3 has 4.5.0 and fedora14 has 4.5.1

Yinghai
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