linux-kernel - Re: [PATCH] FRV: do_gettimeofday() should no longer use tickadj

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Message-ID: <10720.1157711152@warthog.cambridge.redhat.com>
Date:	Fri, 08 Sep 2006 11:25:52 +0100
From:	David Howells <dhowells@...hat.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	David Howells <dhowells@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	john stultz <johnstul@...ibm.com>,
	Adrian Bunk <bunk@...sta.de>, Andrew Morton <akpm@...l.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	netdev@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] FRV: do_gettimeofday() should no longer use tickadj 

Benjamin Herrenschmidt <benh@...nel.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
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