linux-kernel - Re: [PATCH] rcu: Use wrapper for lockdep asserts

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Date:   Wed, 17 Jan 2018 18:00:25 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Josh Triplett <josh@...htriplett.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcu: Use wrapper for lockdep asserts

On Wed, Jan 17, 2018 at 04:41:43PM -0800, Matthew Wilcox wrote:
> On Wed, Jan 17, 2018 at 03:29:13PM -0800, Paul E. McKenney wrote:
> > On Wed, Jan 17, 2018 at 06:24:30AM -0800, Matthew Wilcox wrote:
> > > 
> > > From: Matthew Wilcox <mawilcox@...rosoft.com>
> > > 
> > > Commits c0b334c5bfa9 and ea9b0c8a26a2 introduced new sparse warnings
> > > by accessing rcu_node->lock directly and ignoring the __private
> > > marker.  Introduce a new wrapper and use it.  Also fix a similar problem
> > > in srcutree.c introduced by a3883df3935e.
> > > 
> > > Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
> > 
> > Good catch!  Applied for review and testing.
> > 
> > For some reason, I was expecting 0day to catch this sort of thing...
> 
> Funny you should say, it was 0day which pointed it out to me!  I changed
> lockdep to take a const struct lockdep_map *lock instead of a plain
> struct lockdep_map *lock and I got a whinge from 0day that I'd changed
> some of the warnings, so I looked into it in case it was my fault.

Nary a peep at me.  Regardless, glad you caught it, and thank you for
the fix!

							Thanx, Paul