linux-kernel - Re: [PATCH v2 tip/core/rcu 05/13] decnet: Apply rcu_access

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Message-ID: <20131009235411.GH5790@linux.vnet.ibm.com>
Date:	Wed, 9 Oct 2013 16:54:11 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dhaval Giani <dhaval.giani@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, mingo@...nel.org,
	laijs@...fujitsu.com, Dipankar <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	josh@...htriplett.org, Nivedita Singhvi <niv@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Howells <dhowells@...hat.com>, edumazet@...gle.com,
	Darren Hart <darren@...art.com>,
	Frederic Weisbecker <fweisbec@...il.com>, sbw@....edu,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Graf <tgraf@...g.ch>, Gao feng <gaofeng@...fujitsu.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	linux-decnet-user@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [PATCH v2 tip/core/rcu 05/13] decnet: Apply rcu_access_pointer()
 to avoid sparse false positive

On Wed, Oct 09, 2013 at 06:58:47PM -0400, Dhaval Giani wrote:
> On Wed, Oct 9, 2013 at 5:29 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
> >
> > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> >
> > The sparse checking for rcu_assign_pointer() was recently upgraded
> > to reject non-__kernel address spaces.  This also rejects __rcu,
> > which is almost always the right thing to do.  However, the use in
> > dn_insert_route() is legitimate: It is assigning a pointer to an element
> > from an RCU-protected list, and all elements of this list are already
> > visible to caller.
> >
> > This commit therefore silences this false positive by laundering the
> > pointer using rcu_access_pointer() as suggested by Josh Triplett.
> >
> > Reported-by: kbuild test robot <fengguang.wu@...el.com>
> 
> I did not realize that we were allowed to rename people :-)

Copied and pasted directly from the email I received.  Perhaps strange,
but true!  ;-)

							Thanx, Paul

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