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rcu: Convert WARN_ON_ONCE() in rcu_lock_acquire() to lockdep

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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>
This commit is contained in:
Heiko Carstens 2012-02-01 10:30:46 -08:00 • committed by Paul E. McKenney
parent 7129d383d9
commit bde23c6892
2 changed files with 16 additions and 2 deletions
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4
include/linux/srcu.h
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@ -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);
}