linux-kernel - Re: [PATCH 09/16] percpu: Replace smp_read_barrier_depends() with lockless

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Message-ID: <20141117044300.GM4460@linux.vnet.ibm.com>
Date:	Sun, 16 Nov 2014 20:43:00 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Pranith Kumar <bobby.prani@...il.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/16] percpu: Replace smp_read_barrier_depends() with
 lockless_dereference()

On Fri, Nov 14, 2014 at 08:14:48AM -0500, Tejun Heo wrote:
> On Thu, Nov 13, 2014 at 02:24:15PM -0500, Pranith Kumar wrote:
> > Recently lockless_dereference() was added which can be used in place of
> > hard-coding smp_read_barrier_depends(). The following PATCH makes the change.
> > 
> > Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
> 
> How should this be routed?  There's a pending change on the same
> region of code and if this patch is routed outside percpu tree it'd
> cause a conflict and I can't route this as lockless_dereference()
> isn't in the mainline yet.  Maybe expose a git branch which contaisn
> lockless_dereference() so that percpu can pull it in?

Actually, lockless_dereference() is now in mainline, if that makes it
easier.

							Thanx, Paul

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