netdev - Re: [PATCH 02/36] scsi,rcu: convert call_rcu(fc_rport_free_rcu) to kfree

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Date:	Wed, 23 Mar 2011 05:22:57 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Robert Love <robert.w.love@...el.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, Jens Axboe <axboe@...nel.dk>,
	"James E.J. Bottomley" <James.Bottomley@...e.de>,
	Neil Horman <nhorman@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Tejun Heo <tj@...nel.org>, Jarek Poplawski <jarkao2@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...n-fcoe.org" <devel@...n-fcoe.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 02/36] scsi,rcu: convert call_rcu(fc_rport_free_rcu) to
	kfree_rcu()

On Tue, Mar 22, 2011 at 11:50:14PM -0700, Paul E. McKenney wrote:
> On Tue, Mar 22, 2011 at 10:28:33AM -0700, Robert Love wrote:
> > On Thu, 2011-03-17 at 20:41 -0700, Lai Jiangshan wrote:
> > > -	call_rcu(&rdata->rcu, fc_rport_free_rcu);
> > > +	kfree_rcu(rdata, rcu);
> > 
> > I think this last line should be:
> > 
> > kfree_rcu(rdata, &rdata->rcu);
> 
> Hello, Robert,
> 
> I believe that it is correct as is.  The kfree_rcu() definition is as
> follows:
> 
> #define kfree_rcu(ptr, rcu_head)					\
> 	__kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head))
> 
> Then __kfree_rcu() encodes the offset into the rcu_head so that it can
> be handled properly at the end of the grace period.

To be fair to Robert, I had the same thought, but decided to check the
definition of kfree_rcu before I made the same comment.  Unfortunately,
the definition of kfree_rcu is still not in Linus' tree (and there's no
indication in the patch series about where to find the definition).  It
would have been better if kfree_rcu were patch 1/n in the series, then
we'd've been able to review it more effectively.

Any idea when kfree_rcu will be submitted to Linus?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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