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| author | Paul E. McKenney | 2010-05-13 21:32:28 +0200 |
|---|---|---|
| committer | Paul E. McKenney | 2010-06-15 01:37:26 +0200 |
| commit | a25909a4d4a29e272f953e12595bf2f04a292dbd (patch) | |
| tree | 86b54bc29aa126eff797b98728133ea960f8bd01 /include/linux/workqueue.h | |
| parent | rcu: add __rcu API for later sparse checking (diff) | |
| download | kernel-qcow2-linux-a25909a4d4a29e272f953e12595bf2f04a292dbd.tar.gz kernel-qcow2-linux-a25909a4d4a29e272f953e12595bf2f04a292dbd.tar.xz kernel-qcow2-linux-a25909a4d4a29e272f953e12595bf2f04a292dbd.zip | |
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>
Diffstat (limited to 'include/linux/workqueue.h')
| -rw-r--r-- | include/linux/workqueue.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h index 9466e860d8c2..d0f7c8178498 100644 --- a/include/linux/workqueue.h +++ b/include/linux/workqueue.h @@ -297,4 +297,8 @@ static inline long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg) #else long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg); #endif /* CONFIG_SMP */ + +#ifdef CONFIG_LOCKDEP +int in_workqueue_context(struct workqueue_struct *wq); +#endif #endif |