From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [PATCH RT] kernel/hrtimer: be non-freezeable in cpu_chill()
Date: Wed, 19 Feb 2014 16:42:13 +0100
Message-ID: <5304D0D5.3030802@linutronix.de>
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Cc: LKML <linux-kernel@vger.kernel.org>,
	linux-rt-users <linux-rt-users@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Clark Williams <williams@redhat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@uudg.org>,
	John Kacur <jkacur@redhat.com>,
	Ulrich Obergfell <uobergfe@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
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On 02/19/2014 04:27 PM, Steven Rostedt wrote:

> Hmm, I wonder if this is because msleep() sets the tasks state to
> TASK_UNINTERRUPTIBLE, and hrtimer_nanosleep sets it to
> TASK_INTERRUPTIBLE.

No, it is because freezable_schedule() is called via do_nanosleep() in
hrtimer call path and msleep() calls schedule() without it.

Sebastian