linux-kernel - [PATCH 4/5] rcu-tasks: Fix read-side primitives comment for call_rcu_tasks

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Message-Id: <1629271723-3816-5-git-send-email-neeraju@codeaurora.org>
Date:   Wed, 18 Aug 2021 12:58:42 +0530
From:   Neeraj Upadhyay <neeraju@...eaurora.org>
To:     paulmck@...nel.org, josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        joel@...lfernandes.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        urezki@...il.com, frederic@...nel.org, boqun.feng@...il.com,
        Neeraj Upadhyay <neeraju@...eaurora.org>
Subject: [PATCH 4/5] rcu-tasks: Fix read-side primitives comment for call_rcu_tasks_trace

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@...eaurora.org>
---
 kernel/rcu/tasks.h | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 244e06a..5f9c14c 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1214,13 +1214,9 @@ static void exit_tasks_rcu_finish_trace(struct task_struct *t)
  *
  * 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.
+ * 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.
-- 
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