linux-kernel - Re: [patch] x86_64, irq: check remote IRR bit before migrating level triggered irq

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Message-ID: <86802c440705181128t28652911w39d6de0c43d99a45@mail.gmail.com>
Date:	Fri, 18 May 2007 11:28:25 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>, mingo@...e.hu,
	ak@...e.de, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, "Zou, Nanhai" <nanhai.zou@...el.com>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	"Packard, Keith" <keith.packard@...el.com>
Subject: Re: [patch] x86_64, irq: check remote IRR bit before migrating level triggered irq

On 5/18/07, Siddha, Suresh B <suresh.b.siddha@...el.com> wrote:
>
> If the vector number stays same during irq migration and if we reset remote
> IRR bit using the above method(edge and then back to level) during
> irq migration, then we have a problem. A new interrupt arriving on a new
> cpu will set the remote IRR bit and now the old inflight EOI broadcast
> reaches IOAPIC RTE(resetting the remote IRR bit, because the vector in the
> broadcast msg is same), while the kernel code still assumes that the remote
> IRR bit is still set. This will lead to more problems and issues.

coud add some line __assign_irq_vector. to make sure old_vector!=vector.

YH
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