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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-02-01 22:30:46 +0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-02-21 21:06:09 +0400
commitbde23c6892878e48f64de668660778991bc2fb56 (patch)
tree50d3ed77d58acc9098a2030be66728bc8c59f63e /include/linux/srcu.h
parent7129d383d9f46eb8276bee5fb46df63f09a70130 (diff)
downloadlinux-bde23c6892878e48f64de668660778991bc2fb56.tar.xz
rcu: Convert WARN_ON_ONCE() in rcu_lock_acquire() to lockdep
The WARN_ON_ONCE() in rcu_lock_acquire() results in infinite recursion on S390, and also doesn't print very much information. Remove this. Updated patch to add lockdep-RCU assertions to RCU's read-side primitives. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/srcu.h')
-rw-r--r--include/linux/srcu.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 9a323728e60c..d3d5fa54f25e 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -172,6 +172,8 @@ static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
int retval = __srcu_read_lock(sp);
rcu_lock_acquire(&(sp)->dep_map);
+ rcu_lockdep_assert(!rcu_is_cpu_idle(),
+ "srcu_read_lock() used illegally while idle");
return retval;
}
@@ -185,6 +187,8 @@ static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
static inline void srcu_read_unlock(struct srcu_struct *sp, int idx)
__releases(sp)
{
+ rcu_lockdep_assert(!rcu_is_cpu_idle(),
+ "srcu_read_unlock() used illegally while idle");
rcu_lock_release(&(sp)->dep_map);
__srcu_read_unlock(sp, idx);
}