linux-kernel - Re: [PATCH 2/3 RFC paul/rcu/srcu] srcu: only increase the upper bit for srcu_read

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Date:	Wed, 22 Feb 2012 16:39:15 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	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, peterz@...radead.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org
Subject: Re: [PATCH 2/3 RFC paul/rcu/srcu] srcu: only increase the upper bit
 for srcu_read_lock()

On Wed, 2012-02-22 at 13:26 -0800, Paul E. McKenney wrote:

> Make that without underflow -- one increment and 2^31+1 decrements would
> in fact return the counter to its original value, but that would require
> cramming more than two billion tasks into a 32-bit address space, which
> I believe to be sufficiently unlikely.  (Famous last words...)

I'll just expect to see you as President of the United States, counting
your money you won in the lottery, and being awarded a Nobel Prize for
curing cancer.

-- Steve



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