linux-kernel - Re: [patch 0/6] x86: cleanups and fixes for irq migration code during cpu offline

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Message-Id: <1256930729.2679.10.camel@sbs-t61.sc.intel.com>
Date:	Fri, 30 Oct 2009 11:25:29 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Ingo Molnar <mingo@...e.hu>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>
Cc:	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"garyhade@...ibm.com" <garyhade@...ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/6] x86: cleanups and fixes for irq migration code
 during cpu offline

On Mon, 2009-10-26 at 15:24 -0700, Siddha, Suresh B wrote:
> First four patches in the series unify the fixup_irqs() along with
> couple of cleanups. It also fixes an issue where the interrupt subsystem can 
> point the interrupt to the offlined cpu (for non interrupt-remapping case)
> causing the device to not work. This was observed by Gary.
> 
> These four patches are ready for inclusion

Ingo, if no one has any objections, can you please consider the first
four patches in this patchset for -tip testing?

> and while there was a debate
> in the past that fixup_irqs() is kind of broken (because of migrating
> interrupts in the process context for non intr-remapping platforms)
> we think that these patches enhance the existing code and not introduce any
> more new races.
> 
> The last two patches in the series are titled as RFC. 

Eric, any thoughts on these two RFC patches or the other 4 patches that
are ready to go.

> These patches
> address removing the local_irq_enable()/local_irq_disable() in
> the fixup_irqs(). All the patches (including these last two RFC patches) are
> tested on Intel platforms (by myself) and on AMD platforms(by Gary).
> 
> We labeled the last two patches as RFC mainly because they need more testing and
> thoughts from Eric and others who did some unsuccessful experiments in this
> area (migrating irq in the process context for non intr-remapping platforms)
> before.

thanks,
suresh

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