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Date: Tue, 30 Dec 2014 20:07:40 +0100
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v2] srcu: Isolate srcu sections using CONFIG_SRCU
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To: Pranith Kumar <bobby.prani@gmail.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>, Tiejun Chen <tiejun.chen@windriver.com>, Paul Mackerras <paulus@samba.org>, Daniel Walter <dwalter@google.com>, Ingo Molnar <mingo@kernel.org>, "open list:S390" <linux-s390@vger.kernel.org>, Vincent Guittot <vincent.guittot@linaro.org>, Christian Borntraeger <borntraeger@de.ibm.com>, Jens Freimann <jfrei@linux.vnet.ibm.com>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, Josh Triplett <josh@joshtriplett.org>, Steven Rostedt <rostedt@goodmis.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, Anton Blanchard <anton@samba.org>, Scott Wood <scottwood@freescale.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, Li Zhong <zhong@linux.vnet.ibm.com>, Nishanth Aravamudan <nacc@linux.vnet.ibm.com>, open list <linux-kernel@vger.kernel.org>, "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>, Martin Schwidefsky <schwidefsky@de.ibm.com>, "supporter:S390" <linux390@de.ibm.com>, "open list:LINUX FOR POWERPC..." <linuxppc-dev@lists.ozlabs.org>
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On Tue, Dec 30, 2014 at 01:54:07PM -0500, Pranith Kumar wrote:
> On Tue, Dec 30, 2014 at 1:50 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> > 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?
> 
> This is part of the kernel tinification efforts. The first patch was
> posted here: https://lkml.org/lkml/2014/12/4/848. This patch enables a
> compile time failure instead of a link time failure.

can't be arsed to click. again, why does it matter when it fails,
neither stages produces a working kernel so tinification cannot be the
purpose.