diff options
Diffstat (limited to 'kernel/rcu/srcu.c')
| -rw-r--r-- | kernel/rcu/srcu.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c index ef3bcfb15b39..584d8a983883 100644 --- a/kernel/rcu/srcu.c +++ b/kernel/rcu/srcu.c @@ -22,7 +22,7 @@ * Lai Jiangshan <laijs@cn.fujitsu.com> * * For detailed explanation of Read-Copy Update mechanism see - - * Documentation/RCU/ *.txt + * Documentation/RCU/ *.txt * */ @@ -243,8 +243,14 @@ static bool srcu_readers_active(struct srcu_struct *sp) * cleanup_srcu_struct - deconstruct a sleep-RCU structure * @sp: structure to clean up. * - * Must invoke this after you are finished using a given srcu_struct that - * was initialized via init_srcu_struct(), else you leak memory. + * Must invoke this only after you are finished using a given srcu_struct + * that was initialized via init_srcu_struct(). This code does some + * probabalistic checking, spotting late uses of srcu_read_lock(), + * synchronize_srcu(), synchronize_srcu_expedited(), and call_srcu(). + * If any such late uses are detected, the per-CPU memory associated with + * the srcu_struct is simply leaked and WARN_ON() is invoked. If the + * caller frees the srcu_struct itself, a use-after-free crash will likely + * ensue, but at least there will be a warning printed. */ void cleanup_srcu_struct(struct srcu_struct *sp) { |