From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 3 Mar 2010 15:46:57 +0000 (-0800)
Subject: rcu: Suppress RCU lockdep warnings during early boot
X-Git-Tag: v2.6.34-rc2~51^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=54dbf96c921513bf98484a20ef366d51944a4c4d;p=pandora-kernel.git

rcu: Suppress RCU lockdep warnings during early boot

RCU is used during very early boot, before RCU and lockdep have
been initialized.  So make the underlying primitives
(rcu_read_lock_held(), rcu_read_lock_bh_held(),
rcu_read_lock_sched_held(), and rcu_dereference_check()) check
for early boot via the rcu_scheduler_active flag.  This will
suppress false positives.

Also introduce a debug_lockdep_rcu_enabled() static inline
helper function, which tags the CONTINUE_PROVE_RCU case as
likely(), as suggested by Ingo Molnar.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1267631219-8713-2-git-send-email-paulmck@linux.vnet.ibm.com>
[ v2: removed incomplete debug_lockdep_rcu_update() bits ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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