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Subject: Re: [patch] rt: res_counter fix, v2
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@tglx.de>,
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Date: Thu, 12 Feb 2009 15:41:41 +0100
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On Thu, 2009-02-12 at 15:28 +0100, Frederic Weisbecker wrote:
> > [   45.228589] hardirqs last disabled at (0): [<ffffffff8025449d>] copy_process+0x68d/0x1500
> > [   45.228602] softirqs last  enabled at (0): [<ffffffff8025449d>] copy_process+0x68d/0x1500
> 
> 
> The reason for which I wanted to send an irqsoff trace is that the above lines are false.

copy_process() has:

#endif
	p->hardirq_enable_ip = 0;
	p->hardirq_enable_event = 0;
	p->hardirq_disable_ip = _THIS_IP_;
	p->hardirq_disable_event = 0;
	p->softirqs_enabled = 1;
	p->softirq_enable_ip = _THIS_IP_;
	p->softirq_enable_event = 0;
	p->softirq_disable_ip = 0;
	p->softirq_disable_event = 0;
	p->hardirq_context = 0;
	p->softirq_context = 0;
#endif

the sequence count of 0 basically tells you it hasn't been set yet.