From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Howells <dhowells@redhat.com>
Subject: Re: [PATCH] FRV: do_gettimeofday() should no longer use tickadj
Date: Fri, 08 Sep 2006 11:25:52 +0100
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Cc: David Howells <dhowells@redhat.com>, Ingo Molnar <mingo@elte.hu>,
	john stultz <johnstul@us.ibm.com>,
	Adrian Bunk <bunk@stusta.de>, Andrew Morton <akpm@osdl.org>,
	Arjan van de Ven <arjan@linux.intel.com>,
	linux-kernel@vger.kernel.org, Jeff Garzik <jeff@garzik.org>,
	netdev@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> No, you do a chain handler. Look at how I do it in
> arch/powerpc/platform/pseries/setup.c for example. It's actually
> trivial. You install a special flow handler (which means that there is
> very little overhead, almost none, from the toplevel irq to the chained
> irq). You can _also_ if you want just install an IRQ handler for the
> cascaded controller and call generic_handle_irq (rather than __do_IRQ)
> from it, but that has more overhead. A chained handler completely
> relaces the flow handler for the cascade, and thus, if you don't need
> all of the nits and bits of the other flow handlers for your cascade,
> you can speed things up by hooking at that level.

Please update Documentation/DocBook/genericirq.tmpl.  That doesn't mention it.

David