linux-kernel - Re: 2.6.24-rc7-rt2

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Message-Id: <200801171811.34641.m.kozlowski@tuxland.pl>
Date:	Thu, 17 Jan 2008 18:11:33 +0100
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc7-rt2

Hello,

> > I found this in dmesg:
> >
> > BUG: swapper:0 task might have lost a preemption check!
> > Pid: 0, comm: swapper Not tainted 2.6.24-rc7-rt2 #3
> >  [<c010386b>] show_trace_log_lvl+0x1d/0x3b
> >  [<c01042f3>] show_trace+0x12/0x14
> >  [<c0104a2f>] dump_stack+0x6a/0x70
> >  [<c0115419>] preempt_enable_no_resched+0x5c/0x5e
> 
> This is really really strange. cpu_idle calls __preempt_enable_no_resched
> and not preempt_enable_no_resched (notice the prefixed underscores).
> So I don't know how you got that output. Did you get any strance rejects
> in applying this patch?

Nope. Your rt patch applied cleanly to vanilla 2.6.24-rc7.

Regards,

	Mariusz

> >  [<c0100e35>] cpu_idle+0x6d/0x82
> >  [<c0323b6e>] rest_init+0x66/0x68
> >  [<c043aba6>] start_kernel+0x20c/0x276
> >  [<00000000>] 0x0
> >  =======================
> > ---------------------------
> > | preempt count: 00000000 ]
> > | 0-level deep critical section nesting:
> > ----------------------------------------
> >
> > Box runs fine though.
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