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rcu-tasks: Fix read-side primitives comment for call_rcu_tasks_trace

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call_rcu_tasks_trace() does have read-side primitives - rcu_read_lock_trace()
and rcu_read_unlock_trace(). Fix this information in the comments.

Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Neeraj Upadhyay 2021-08-25 12:40:50 +05:30 committed by Paul E. McKenney
parent a6517e9ce0
commit ed42c38067
1 changed files with 6 additions and 10 deletions
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16
kernel/rcu/tasks.h
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@ -1207,15 +1207,11 @@ static void exit_tasks_rcu_finish_trace(struct task_struct *t)
* @rhp: structure to be used for queueing the RCU updates.
* @func: actual callback function to be invoked after the grace period
*
* The callback function will be invoked some time after a full grace
* period elapses, in other words after all currently executing RCU
* read-side critical sections have completed. call_rcu_tasks_trace()
* assumes that the read-side critical sections end at context switch,
* cond_resched_rcu_qs(), or transition to usermode execution. As such,
* there are no read-side primitives analogous to rcu_read_lock() and
* rcu_read_unlock() because this primitive is intended to determine
* that all tasks have passed through a safe state, not so much for
* data-structure synchronization.
* The callback function will be invoked some time after a trace rcu-tasks
* grace period elapses, in other words after all currently executing
* trace rcu-tasks read-side critical sections have completed. These
* read-side critical sections are delimited by calls to rcu_read_lock_trace()
* and rcu_read_unlock_trace().
*
* See the description of call_rcu() for more detailed information on
* memory ordering guarantees.
@ -1231,7 +1227,7 @@ EXPORT_SYMBOL_GPL(call_rcu_tasks_trace);
*
* Control will return to the caller some time after a trace rcu-tasks
* grace period has elapsed, in other words after all currently executing
* rcu-tasks read-side critical sections have elapsed. These read-side
* trace rcu-tasks read-side critical sections have elapsed. These read-side
* critical sections are delimited by calls to rcu_read_lock_trace()
* and rcu_read_unlock_trace().
*