linux-kernel - Re: [PATCH RFC tip/core/rcu 17/28] rcu: Make srcu_read_lock_held() call common lockdep-enabled function

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Message-ID: <20111103132942.GY2287@linux.vnet.ibm.com>
Date:	Thu, 3 Nov 2011 06:29:42 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Josh Triplett <josh@...htriplett.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org
Subject: Re: [PATCH RFC tip/core/rcu 17/28] rcu: Make srcu_read_lock_held()
 call common lockdep-enabled function

On Thu, Nov 03, 2011 at 12:14:20PM +0100, Frederic Weisbecker wrote:
> On Wed, Nov 02, 2011 at 08:48:54PM -0700, Josh Triplett wrote:
> > On Wed, Nov 02, 2011 at 01:30:38PM -0700, Paul E. McKenney wrote:
> > > From: Frederic Weisbecker <fweisbec@...il.com>
> > > 
> > > A common debug_lockdep_rcu_enabled() function is used to check whether
> > > RCU lockdep splats should be reported, but srcu_read_lock() does not
> > > use it.  This commit therefore brings srcu_read_lock_held() up to date.
> > > 
> > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > Just how signed off does this patch need to be? ;)

If you have sufficient patience to scroll past the Signed-off-by's
to see the patch, then there clearly are not enough.  ;-)

> Dunno but I feel uncomfortable now with that strange feeling I'm walking
> on the street with two Paul holding my hand on each side.

I did catch one of these, but missed the other.  Here is the history:

o	Paul wrote the patch.

o	Frederic reworked the patches that this one depended on,
	and then resent the patch.

o	Paul did "git am -s" on the series that Frederic sent,
	which added the extra Signed-off-by.
	
It is not clear to me what the Signed-off-by chain should look like in
this case.  My default action would be to remove my second Signed-off-by.

							Thanx, Paul

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