diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-07-07 18:12:26 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-08-30 16:03:35 -0700 |
| commit | 8fa946d42855c2e3a481bf105aa2b25cefebe111 (patch) | |
| tree | a9dd2693249f460ff351d99d269ecdf912b55519 /kernel/rcu | |
| parent | 49918a54e63c99899aa3aa64d456c5bf14122e5a (diff) | |
rcu: Clean up flavor-related definitions and comments in tree_exp.h
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree_exp.h | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h index 060bdb45cd95..78553a8fa3c6 100644 --- a/kernel/rcu/tree_exp.h +++ b/kernel/rcu/tree_exp.h @@ -601,8 +601,8 @@ static void wait_rcu_exp_gp(struct work_struct *wp) } /* - * Given an rcu_state pointer and a smp_call_function() handler, kick - * off the specified flavor of expedited grace period. + * Given a smp_call_function() handler, kick off the specified + * implementation of expedited grace period. */ static void _synchronize_rcu_expedited(smp_call_func_t func) { @@ -721,7 +721,7 @@ static void sync_rcu_exp_handler(void *unused) resched_cpu(rdp->cpu); } -/* PREEMPT=y, so no RCU-sched to clean up after. */ +/* PREEMPT=y, so no PREEMPT=n expedited grace period to clean up after. */ static void sync_sched_exp_online_cleanup(int cpu) { } @@ -798,13 +798,13 @@ static void sync_sched_exp_online_cleanup(int cpu) } /* - * Because a context switch is a grace period for RCU-sched, any blocking - * grace-period wait automatically implies a grace period if there - * is only one CPU online at any point time during execution of either - * synchronize_sched() or synchronize_rcu_bh(). It is OK to occasionally - * incorrectly indicate that there are multiple CPUs online when there - * was in fact only one the whole time, as this just adds some overhead: - * RCU still operates correctly. + * Because a context switch is a grace period for !PREEMPT, any + * blocking grace-period wait automatically implies a grace period if + * there is only one CPU online at any point time during execution of + * either synchronize_rcu() or synchronize_rcu_expedited(). It is OK to + * occasionally incorrectly indicate that there are multiple CPUs online + * when there was in fact only one the whole time, as this just adds some + * overhead: RCU still operates correctly. */ static int rcu_blocking_is_gp(void) { @@ -823,7 +823,7 @@ void synchronize_rcu_expedited(void) RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map) || lock_is_held(&rcu_lock_map) || lock_is_held(&rcu_sched_lock_map), - "Illegal synchronize_sched_expedited() in RCU read-side critical section"); + "Illegal synchronize_rcu_expedited() in RCU read-side critical section"); /* If only one CPU, this is automatically a grace period. */ if (rcu_blocking_is_gp()) |