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From: Thomas Gleixner <tglx@linutronix.de>
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To: Felix Moessbauer <felix.moessbauer@siemens.com>, stable@vger.kernel.org
Cc: dave@stgolabs.net, bigeasy@linutronix.de, petr.ivanov@siemens.com,
 jan.kiszka@siemens.com
Subject: Re: [PATCH][5.10, 5.15, 6.1][1/1] hrtimer: Ignore slack time for RT
 tasks in schedule_hrtimeout_range()
In-Reply-To: <20240219080851.27386-2-felix.moessbauer@siemens.com>
References: <20240219080851.27386-1-felix.moessbauer@siemens.com>
 <20240219080851.27386-2-felix.moessbauer@siemens.com>
Date: Mon, 19 Feb 2024 12:21:03 +0100
Message-ID: <87sf1oaee8.ffs@tglx>
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On Mon, Feb 19 2024 at 09:08, Felix Moessbauer wrote:
> From: Davidlohr Bueso <dave@stgolabs.net>

This lacks a reference to the upstream commit.

Commit 0c52310f260014d95c1310364379772cb74cf82d upstream.

> While in theory the timer can be triggered before expires + delta, for the
> cases of RT tasks they really have no business giving any lenience for
> extra slack time, so override any passed value by the user and always use
> zero for schedule_hrtimeout_range() calls. Furthermore, this is similar to
> what the nanosleep(2) family already does with current->timer_slack_ns.
>
> Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Link: https://lore.kernel.org/r/20230123173206.6764-3-dave@stgolabs.net