linux-kernel - Re: [PATCH v3 2/4] genirq: Inform handler about line sharing state

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Message-ID: <alpine.LFD.2.00.1012151658450.12146@localhost6.localdomain6>
Date:	Wed, 15 Dec 2010 17:02:33 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jan Kiszka <jan.kiszka@...mens.com>
cc:	Jan Kiszka <jan.kiszka@....de>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>, Tom Lyon <pugs@...co.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH v3 2/4] genirq: Inform handler about line sharing state

On Wed, 15 Dec 2010, Jan Kiszka wrote:
> Am 15.12.2010 16:41, Thomas Gleixner wrote:
> > Talking about headache. Your solution above does not prevent that
> > scenario.
> > 
> >  CPU 0                  CPU 1
> > 		
> >  synchronize_irq();
> > 		        hard irq comes in sees shared and unmasks
> 
> Nope, IRQ_ONESHOT is already cleared at that point.

Errm ? It's set. Could you please stop to increase my confusion ? :)

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