linux-kernel - Re: [PATCH] task_work: cleanup notification modes

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Date:   Fri, 16 Oct 2020 17:13:18 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] task_work: cleanup notification modes

On 10/16/20 5:09 PM, Thomas Gleixner wrote:
> On Fri, Oct 16 2020 at 16:39, Jens Axboe wrote:
>> On 10/16/20 3:44 PM, Thomas Gleixner wrote:
>>>> - * @notify: send the notification if true
>>>> + * @notify: send chosen notification, if any
>>>
>>> Is that really all you found to be wrong in that comment?
>>
>> There really is nothing wrong, but it's not very descriptive (wasn't
>> before either).
> 
>  * This is like the signal handler which runs in kernel mode, but it doesn't                                                                                                                                                                                                   
>  * try to wake up the @task.   
> 
> If find a lot of wrongs in that sentence in context of TWA_SIGNAL.
> 
> Agreed, it was hard to understand before that, but with TWA_SIGNAL it
> does not make sense at all.

This is what I currently have:

/**
 * task_work_add - ask the @task to execute @work->func()
 * @task: the task which should run the callback
 * @work: the callback to run
 * @notify: how to notify the targeted task
 *
 * Queue @work for task_work_run() below and notify the @task if @notify
 * is @TWA_RESUME or @TWA_SIGNAL. @TWA_SIGNAL work like signals, in that the
 * it will interrupt the targeted task and run the task_work. @TWA_RESUME
 * work is run only when the task exits the kernel and returns to user mode.
 * Fails if the @task is exiting/exited and thus it can't process this @work.
 * Otherwise @work->func() will be called when the @task returns from kernel
 * mode or exits.
 *
 * Note: there is no ordering guarantee on works queued here.
 *
 * RETURNS:
 * 0 if succeeds or -ESRCH.
 */

-- 
Jens Axboe