diff options
Diffstat (limited to 'kernel/rcu/rcu.h')
| -rw-r--r-- | kernel/rcu/rcu.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index 1c5cbd9d7c97..aa215d6355f8 100644 --- a/kernel/rcu/rcu.h +++ b/kernel/rcu/rcu.h @@ -143,6 +143,15 @@ static inline bool rcu_seq_new_gp(unsigned long old, unsigned long new) } /* + * Roughly how many full grace periods have elapsed between the collection + * of the two specified grace periods? + */ +static inline unsigned long rcu_seq_diff(unsigned long new, unsigned long old) +{ + return (new - old) >> RCU_SEQ_CTR_SHIFT; +} + +/* * debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally * by call_rcu() and rcu callback execution, and are therefore not part of the * RCU API. Leaving in rcupdate.h because they are used by all RCU flavors. |