linux-kernel - Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call

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Message-ID: <1331374349.18960.15.camel@twins>
Date:	Sat, 10 Mar 2012 11:12:29 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Lai Jiangshan <eag0628@...il.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org
Subject: Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine
 call_srcu()

On Thu, 2012-03-08 at 11:49 -0800, Paul E. McKenney wrote:
> 
> I too have used (long)(a - b) for a long time, but I saw with my own eyes
> the glee in the compiler-writers' eyes when they discussed signed overflow
> being undefined in the C standard.  I believe that the reasons for signed
> overflow being undefined are long obsolete, but better safe than sorry. 

Thing is, if they break that the whole kernel comes falling down, I
really wouldn't worry about RCU at that point. But to each their
pet-paranoia I guess ;-)
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