linux-kernel - Re: [PATCH 0/8] tip related: radix tree for spareseirq and logical flat clean up

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Date:	Sat, 13 Feb 2010 14:26:04 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH  0/8] tip related: radix tree for spareseirq and logical flat clean up

Jeremy Fitzhardinge <jeremy@...p.org> writes:

> I don't have the code in front of me, but I think that change should be OK.  Xen just wants to initiate interrupt delivery for a given irq.  At least for x86; I won't make any claims for ia64.

Thanks.

For ia64 the change should be a noop, generic_handle_irq_desc calls
__do_IRQ when needed.

On x86 the big differences are:
- No more stack overflow check.
- Not switching to the irq stack for i386.

Eric
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