LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Paul E. McKenney" <paulmck@kernel.org>
To: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: josh@joshtriplett.org, rostedt@goodmis.org,
	mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com,
	joel@joelfernandes.org, rcu@vger.kernel.org,
	linux-kernel@vger.kernel.org, urezki@gmail.com,
	frederic@kernel.org, boqun.feng@gmail.com
Subject: Re: [PATCH v2 4/5] rcu-tasks: Fix read-side primitives comment for call_rcu_tasks_trace
Date: Wed, 25 Aug 2021 10:08:55 -0700	[thread overview]
Message-ID: <20210825170855.GJ4156@paulmck-ThinkPad-P17-Gen-1> (raw)
In-Reply-To: <1629875451-20628-5-git-send-email-neeraju@codeaurora.org>

On Wed, Aug 25, 2021 at 12:40:50PM +0530, Neeraj Upadhyay wrote:
> 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>

Queued for v5.16, thank you very much!

(The other four patches are already queued.)

							Thanx, Paul

> ---
>  kernel/rcu/tasks.h | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
> index 244e06a..c5f1c2f 100644
> --- a/kernel/rcu/tasks.h
> +++ b/kernel/rcu/tasks.h
> @@ -1212,15 +1212,11 @@ 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.
> @@ -1236,7 +1232,7 @@ 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().
>   *
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, 
> hosted by The Linux Foundation
> 

  reply	other threads:[~2021-08-25 17:08 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25  7:10 [PATCH v2 0/5] rcu-tasks miscellaneous fixes Neeraj Upadhyay
2021-08-25  7:10 ` [PATCH v2 1/5] rcu-tasks: Fix s/rcu_add_holdout/trc_add_holdout/ typo in comment Neeraj Upadhyay
2021-08-25  7:10 ` [PATCH v2 2/5] rcu-tasks: Correct firstreport usage in check_all_holdout_tasks_trace Neeraj Upadhyay
2021-08-25  7:10 ` [PATCH v2 3/5] rcu-tasks: Correct check for no_hz_full cpu in show_stalled_task_trace Neeraj Upadhyay
2021-08-25  7:10 ` [PATCH v2 4/5] rcu-tasks: Fix read-side primitives comment for call_rcu_tasks_trace Neeraj Upadhyay
2021-08-25 17:08   ` Paul E. McKenney [this message]
2021-08-25  7:10 ` [PATCH v2 5/5] rcu-tasks: Clarify read side section info for rcu_tasks_rude GP primitives Neeraj Upadhyay

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210825170855.GJ4156@paulmck-ThinkPad-P17-Gen-1 \
    --to=paulmck@kernel.org \
    --cc=boqun.feng@gmail.com \
    --cc=frederic@kernel.org \
    --cc=jiangshanlai@gmail.com \
    --cc=joel@joelfernandes.org \
    --cc=josh@joshtriplett.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mathieu.desnoyers@efficios.com \
    --cc=neeraju@codeaurora.org \
    --cc=rcu@vger.kernel.org \
    --cc=rostedt@goodmis.org \
    --cc=urezki@gmail.com \
    --subject='Re: [PATCH v2 4/5] rcu-tasks: Fix read-side primitives comment for call_rcu_tasks_trace' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).