@@ -329,10 +329,7 @@ Answer:
was first added back in 2005. This is because on_each_cpu()
disables preemption, which acted as an RCU read-side critical
section, thus preventing CPU 0's grace period from completing
- until on_each_cpu() had dealt with all of the CPUs. However,
- with the advent of preemptible RCU, rcu_barrier() no longer
- waited on nonpreemptible regions of code in preemptible kernels,
- that being the job of the new rcu_barrier_sched() function.
+ until on_each_cpu() had dealt with all of the CPUs.
However, with the RCU flavor consolidation around v4.20, this
possibility was once again ruled out, because the consolidated
@@ -806,11 +806,9 @@ do { \
* sections, invocation of the corresponding RCU callback is deferred
* until after the all the other CPUs exit their critical sections.
*
- * In v5.0 and later kernels, synchronize_rcu() and call_rcu() also
- * wait for regions of code with preemption disabled, including regions of
- * code with interrupts or softirqs disabled. In pre-v5.0 kernels, which
- * define synchronize_sched(), only code enclosed within rcu_read_lock()
- * and rcu_read_unlock() are guaranteed to be waited for.
+ * Both synchronize_rcu() and call_rcu() also wait for regions of code
+ * with preemption disabled, including regions of code with interrupts or
+ * softirqs disabled.
*
* Note, however, that RCU callbacks are permitted to run concurrently
* with new RCU read-side critical sections. One way that this can happen
@@ -865,11 +863,10 @@ static __always_inline void rcu_read_lock(void)
* rcu_read_unlock() - marks the end of an RCU read-side critical section.
*
* In almost all situations, rcu_read_unlock() is immune from deadlock.
- * In recent kernels that have consolidated synchronize_sched() and
- * synchronize_rcu_bh() into synchronize_rcu(), this deadlock immunity
- * also extends to the scheduler's runqueue and priority-inheritance
- * spinlocks, courtesy of the quiescent-state deferral that is carried
- * out when rcu_read_unlock() is invoked with interrupts disabled.
+ * This deadlock immunity also extends to the scheduler's runqueue
+ * and priority-inheritance spinlocks, courtesy of the quiescent-state
+ * deferral that is carried out when rcu_read_unlock() is invoked with
+ * interrupts disabled.
*
* See rcu_read_lock() for more information.
*/
The rcu_barrier_sched(), synchronize_sched(), and synchronize_rcu_bh() RCU API members have been gone for many years. This commit therefore removes non-historical instances of them. Reported-by: Joe Perches <joe@perches.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> --- Documentation/RCU/rcubarrier.rst | 5 +---- include/linux/rcupdate.h | 17 +++++++---------- 2 files changed, 8 insertions(+), 14 deletions(-)