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

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Message-ID: <20120223010138.GQ2416@linux.vnet.ibm.com>
Date:	Wed, 22 Feb 2012 17:01:38 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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, Feb 22, 2012 at 04:39:15PM -0500, Steven Rostedt wrote:
> 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.

Those possibilities also seem to me to be sufficiently unlikely.  ;-)

							Thanx, Paul

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