diff options
Diffstat (limited to 'include/linux/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 9ebfd436cec7..8d5740edd63c 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -688,14 +688,10 @@ static inline void rcu_read_unlock(void) /** * rcu_read_lock_bh() - mark the beginning of an RCU-bh critical section * - * This is equivalent of rcu_read_lock(), but to be used when updates - * are being done using call_rcu_bh() or synchronize_rcu_bh(). Since - * both call_rcu_bh() and synchronize_rcu_bh() consider completion of a - * softirq handler to be a quiescent state, a process in RCU read-side - * critical section must be protected by disabling softirqs. Read-side - * critical sections in interrupt context can use just rcu_read_lock(), - * though this should at least be commented to avoid confusing people - * reading the code. + * This is equivalent of rcu_read_lock(), but also disables softirqs. + * Note that synchronize_rcu() and friends may be used for the update + * side, although synchronize_rcu_bh() is available as a wrapper in the + * short term. Longer term, the _bh update-side API will be eliminated. * * Note that rcu_read_lock_bh() and the matching rcu_read_unlock_bh() * must occur in the same context, for example, it is illegal to invoke |