RE: [RFC IA64 Hotplug] [Patch 7/7] migrate_irq.patch

From: Ashok Raj <ashok.raj_at_intel.com>
Date: 2004-04-26 14:47:25
>-----Original Message-----
>From: Kenji Kaneshige [mailto:kaneshige.kenji@jp.fujitsu.com]
>Sent: Sunday, April 25, 2004 8:29 PM
>To: Raj, Ashok; LHCS list
>Cc: linux-ia64@vger.kernel.org; davidm@hpl.hp.com; akpm@osdl.org; Rusty
>Russell; Luck, Tony; Mallick, Asit K; Saxena, Sunil; Shah, Rajesh
>Subject: RE: [RFC IA64 Hotplug] [Patch 7/7] migrate_irq.patch
>
>Hi Ashok,
>
>I think some parts of your patch are required not only to support
>CPU removal, but also to fix the following problem of IRQ affinity of
>current ia64 linux :)
>
>Current irq_affinity_write_proc() changes unmasked RTEs by force.
>But I think it is dangerous because it might cause a race condition
>if some interrupts are generated while changing the RTE.
>
>Your patch solves this problem by changing the RTE while the
>interrupt is pending, doesn't it?

Thanks for looking in to the patch Kaneshige san. 

You are correct. This patch also has a portion required by general affinity
handler code. I was planning to do this separately, but got a little lazy
and put both together.. :-) 

Cheers,
Ashok Raj
[Linux core software team]

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Received on Mon Apr 26 00:48:13 2004

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