linux-kernel - Re: [PATCH tip/core/rcu 04/13] wireless: Apply rcu_access

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Message-ID: <20130925182608.GY9093@linux.vnet.ibm.com>
Date:	Wed, 25 Sep 2013 11:26:08 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu, Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH tip/core/rcu 04/13] wireless: Apply rcu_access_pointer()
 to avoid sparse false positive

On Wed, Sep 25, 2013 at 06:48:23PM +0100, Ben Hutchings wrote:
> On Tue, 2013-09-24 at 18:35 -0700, Paul E. McKenney 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 uses in
> > cfg80211_combine_bsses() and cfg80211_bss_update() are legitimate:
> > They is assigning a pointer to an element from an RCU-protected list,
> [...]
> 
> 'They is'?  This error is also in the commit messsages for the bridge
> and mac80211 patches, and maybe others that weren't sent to netdev.

Good catch, fixed in four patches.  Yeah, English can be a bit
unfriendly at times to text reuse.  The s/It/They/ should have been
s/It is/They are/.  ;-)

							Thanx, Paul

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