linux-kernel - Re: [PATCH v2] srcu: Isolate srcu sections using CONFIG

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Message-ID: <20141230185008.GA23965@worktop.programming.kicks-ass.net>
Date:	Tue, 30 Dec 2014 19:50:08 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"supporter:S390" <linux390@...ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Scott Wood <scottwood@...escale.com>,
	Anton Blanchard <anton@...ba.org>,
	Daniel Walter <dwalter@...gle.com>,
	Tiejun Chen <tiejun.chen@...driver.com>,
	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Jens Freimann <jfrei@...ux.vnet.ibm.com>,
	"open list:LINUX FOR POWERPC..." <linuxppc-dev@...ts.ozlabs.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:S390" <linux-s390@...r.kernel.org>
Subject: Re: [PATCH v2] srcu: Isolate srcu sections using CONFIG_SRCU

On Tue, Dec 30, 2014 at 12:46:22AM -0500, Pranith Kumar wrote:
> Isolate the SRCU functions and data structures within CONFIG_SRCU so that there
> is a compile time failure if srcu is used when not enabled. This was decided to
> be better than waiting until link time for a failure to occur.

Why?
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