linux-kernel - Re: [PATCH] rcu: Remove redundant CONFIG_PREEMPT

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Message-ID: <CAJhHMCBeqLN4dTS5uswUjwfcajT2LQ63NgbJm-FXRAB-XScsdw@mail.gmail.com>
Date:	Mon, 22 Sep 2014 13:44:08 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc:	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rcu: Remove redundant CONFIG_PREEMPT_RCU option

On Mon, Sep 22, 2014 at 1:01 PM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> On Mon, Sep 22, 2014 at 12:49:24PM -0400, Pranith Kumar wrote:
>> On Mon, Sep 22, 2014 at 12:25 PM, Josh Triplett <josh@...htriplett.org> wrote:
>> >
>> > I think it would actually make more sense to do this the other way
>> > around, if at all: drop TREE_PREEMPT_RCU in favor of PREEMPT_RCU.  The
>> > instances shown here don't care about *which* preemptible RCU
>> > implementation the kernel uses, they just need to behave differently
>> > when preemptible.  Let's also not assume that no new RCU implementation
>> > will ever arise superceding TREE_PREEMPT_RCU.
>>
>> That is exactly what I did first and got the following changelog:
>>
>>  51 files changed, 77 insertions(+), 83 deletions(-)
>>
>> compared to
>>
>>  8 files changed, 19 insertions(+), 25 deletions(-)
>
> Were the bulk of the files defconfig files?  These need not be changed,
> the architecture maintainers handle them.
>

There are only two defconfig files in there. I removed them now. Most
of them are rcutorture config files. I guess that should be fine. I am
sending the patch now.

-- 
Pranith
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