From a25909a4d4a29e272f953e12595bf2f04a292dbd Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Date: Thu, 13 May 2010 12:32:28 -0700
Subject: [PATCH] lockdep: Add an in_workqueue_context() lockdep-based test
 function

Some recent uses of RCU make use of workqueues.  In these uses, execution
within the context of a specific workqueue takes the place of the usual
RCU read-side primitives such as rcu_read_lock(), and flushing of workqueues
takes the place of the usual RCU grace-period primitives.  Checking for
correct use of rcu_dereference() in such cases requires a test of whether
the code is executing in the context of a particular workqueue.  This
commit adds an in_workqueue_context() function that provides this test.
This new function is only defined when lockdep is enabled, which allows
it to be used as the second argument of rcu_dereference_check().

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