From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Wed, 4 Jan 2012 19:44:57 +0000 (-0800)
Subject: rcu: Improve synchronize_rcu() diagnostics
X-Git-Tag: v3.4-rc1~194^2^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18fec7d8758dd416904da205375e6fa667defc80;p=pandora-kernel.git

rcu: Improve synchronize_rcu() diagnostics

Although TREE_PREEMPT_RCU indirectly uses might_sleep() to detect illegal
use of synchronize_sched() and synchronize_rcu_bh() from within an RCU
read-side critical section, this might_sleep() check is bypassed when
there is only a single CPU (for example, when running an SMP kernel on
a single-CPU system).  This patch therefore adds a might_sleep() call
to the rcu_blocking_is_gp() check that is unconditionally invoked from
both synchronize_sched() and synchronize_rcu_bh().

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

Reading git-diff-tree failed