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Date: Sun, 20 Sep 2009 22:42:03 +0400
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Ingo Molnar <mingo@elte.hu>, Sheng Yang <sheng@linux.intel.com>,
       Yinghai Lu <yinghai@kernel.org>,
       Suresh Siddha <suresh.b.siddha@intel.com>, linux-kernel@vger.kernel.org,
       Dimitri Sivanich <sivanich@sgi.com>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] x86: Don't ack_APIC_irq() if lapic is disabled in
	GENERIC_INTERRUPT_VECTOR handler
Message-ID: <20090920184203.GD32176@lenovo>
References: <1252403546-12544-1-git-send-email-sheng@linux.intel.com> <20090920180632.GB8498@elte.hu> <20090920181326.GB32176@lenovo> <20090920182124.GD8498@elte.hu> <20090920183011.GC32176@lenovo>
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[Cyrill Gorcunov - Sun, Sep 20, 2009 at 10:30:11PM +0400]
...
| | > 
| | > iirc it was Xen related patch. So it's not that simple.
| | > 
| | > I've pointed out Sheng about disable_apic. I'm not Xen
| | > specialist but Xen team seem to use specific apic setup
| | > so our "dummy" operations are not involved (case they
| | > set disable_apic=1 without "turn off" apic ops in real).
| | > Something like that.
| | 
| | They should then set a NOP function in that case. We really dont want to 
| | slow down hotpath functions like smp_generic_interrupt() with flaggery.
| | 
| | 	Ingo
| | 
| 
| Well, I suppose we should wait for Sheng's comments.
| I wish I would answer you but I simply don't know Xen
| code :)
| 
| 	-- Cyrill

Wait a bit Ingo, please. It seems I'm having different
patch series in mind. Need to restore mail thread.
Will back soon :)

	-- Cyrill
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