linux-kernel - Re: dynticks: Remove atomic ops for dynticks

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Message-ID: <alpine.DEB.2.11.1409041320040.14314@gentwo.org>
Date:	Thu, 4 Sep 2014 13:21:08 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: dynticks: Remove atomic ops for dynticks_idle

On Thu, 4 Sep 2014, Paul E. McKenney wrote:

> On Thu, Sep 04, 2014 at 10:18:31AM -0500, Christoph Lameter wrote:
> > This is on top of the first patch (but still not against your tree). I
> > wonder what you think about this one. No special operations.
> >
> >
> > Since dynticks_idle is only ever modified by the local cpu we do
> > not need to use atomics there.
> >
> > Signed-off-by: Christoph Lameter <cl@...ux.com>
>
> Sorry, as discussed earlier, this change is non-trivial.  In addition,
> you have not justified the change.

The rationale is quite clear: Use of atomics without the need to use them.

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