linux-kernel - Re: [PATCH] x86: Don't ack_APIC_irq() if lapic is disabled in GENERIC_INTERRUPT

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Date:	Sun, 20 Sep 2009 22:42:03 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Sheng Yang <sheng@...ux.intel.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, Dimitri Sivanich <sivanich@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: Don't ack_APIC_irq() if lapic is disabled in
	GENERIC_INTERRUPT_VECTOR handler

[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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