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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-01-22 02:26:03 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-03-03 22:16:00 +0300 |
| commit | d24209bb689e2c7f7418faec9b4a948e922d24da (patch) | |
| tree | 40db37902a30acb68f5733e666f25ea7b52e8485 /include/linux/rcupdate.h | |
| parent | 6629240575992a6f0d18c46f5160b34527b0e501 (diff) | |
| download | linux-d24209bb689e2c7f7418faec9b4a948e922d24da.tar.xz | |
rcu: Improve diagnostics for blocked critical sections in irq
If an RCU read-side critical section occurs within an interrupt handler
or a softirq handler, it cannot have been preempted. Therefore, there is
a check in rcu_read_unlock_special() checking for this error. However,
when this check triggers, it lacks diagnostic information. This commit
therefore moves rcu_read_unlock()'s lockdep annotation to follow the
call to __rcu_read_unlock() and changes rcu_read_unlock_special()'s
WARN_ON_ONCE() to an lockdep_rcu_suspicious() in order to locate where
the offending RCU read-side critical section began. In addition, the
value of the ->rcu_read_unlock_special field is printed.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 3e6afed51051..70b896e16f19 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -942,9 +942,9 @@ static inline void rcu_read_unlock(void) { rcu_lockdep_assert(rcu_is_watching(), "rcu_read_unlock() used illegally while idle"); - rcu_lock_release(&rcu_lock_map); __release(RCU); __rcu_read_unlock(); + rcu_lock_release(&rcu_lock_map); /* Keep acq info for rls diags. */ } /** |