linux-kernel - Re: [PATCH v3] ipc: Update semtimedop() to use hrtimer

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Date:   Fri, 29 Apr 2022 00:02:25 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Davidlohr Bueso <dave@...olabs.net>,
        Prakash Sangappa <prakash.sangappa@...cle.com>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        peterz@...radead.org, manfred@...orfullife.com
Subject: Re: [PATCH v3] ipc: Update semtimedop() to use hrtimer

On Thu, Apr 28 2022 at 13:50, Davidlohr Bueso wrote:
> On Thu, 28 Apr 2022, Prakash Sangappa wrote:
>>-		if (timeout)
>>-			jiffies_left = schedule_timeout(jiffies_left);
>>-		else
>>-			schedule();
>>+		timed_out = !schedule_hrtimeout_range(exp,
>>+				current->timer_slack_ns, HRTIMER_MODE_ABS);
>
> I'm wondering if the slack parameter instead of passing the timer_slack_ns
> value immediately, we should do a rt_task() check and pass zero if so.

We should have a wrapper function which takes care of that instead of
having checks all over the place.

Thanks,

        tglx