linux-kernel - [PATCH 0/2] rcu_dereference_check

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Message-ID: <20140107181258.GA29288@redhat.com>
Date:	Tue, 7 Jan 2014 19:12:58 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Eric Dumazet <edumazet@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] rcu_dereference_check_fdtable fix/cleanups

Hello.

I tried to audit the users of thread_group_empty() (we need
to change it) and found rcu_my_thread_group_empty() which
looks wrong.

The patches look simple, but I am not sure it is fine to use
rcu_lock_acquire() directly. Perhaps it makes sense to add a
new helper? Note that we have more users which take rcu lock
only to shut up lockdep. Please review.

And I am a bit confused. Perhaps rcu_lock_acquire() should
depend on CONFIG_PROVE_RCU, not on CONFIG_DEBUG_LOCK_ALLOC?
We only need rcu_lock_map/etc for rcu_lockdep_assert().

Oleg.

 fs/file.c                |   24 +++++++++++-------------
 include/linux/fdtable.h  |   19 +++++++++++++------
 include/linux/rcupdate.h |    2 --
 kernel/rcu/update.c      |   11 -----------
 4 files changed, 24 insertions(+), 32 deletions(-)

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