linux-kernel - Re: [PATCH tip/core/rcu 14/17] rcu: remove CONFIG_PROVE_RCU

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Message-ID: <1404807066.26126.9.camel@x220>
Date:	Tue, 08 Jul 2014 10:11:06 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com,
	oleg@...hat.com, sbw@....edu, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH tip/core/rcu 14/17] rcu: remove CONFIG_PROVE_RCU_DELAY

Paul,

On Mon, 2014-07-07 at 15:38 -0700, Paul E. McKenney wrote:
> The CONFIG_PROVE_RCU_DELAY Kconfig parameter doesn't appear to be very
> effective at finding race conditions, so this commit removes it.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Cc: Andi Kleen <ak@...ux.intel.com>
> ---
>  kernel/rcu/tree.c                                       | 5 -----
>  kernel/rcu/update.c                                     | 3 ---

The commit explanation implies that this patch would also remove the
entry for PROVE_RCU_DELAY in lib/Kconfig.debug. Is there any reason to
keep it after this patch?

>  tools/testing/selftests/rcutorture/configs/rcu/TREE01   | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE02   | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE02-T | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE03   | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE04   | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE05   | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE06   | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE07   | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE08   | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE08-T | 1 -
>  tools/testing/selftests/rcutorture/configs/rcu/TREE09   | 1 -
>  13 files changed, 19 deletions(-)

This doesn't touch a few other references in
tools/testing/selftests/rcutorture/. I have no idea how these tests
work, so I assume these references are still needed. Is that correct?


Paul Bolle

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