linux-kernel - Re: [PATCH] Export irq tracepoints for use by kernel modules

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Date:	Tue, 22 Apr 2014 08:00:31 -0700
From:	Drew Richardson <drew.richardson@....com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>,
	Ben Greear <greearb@...delatech.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pawel Moll <Pawel.Moll@....com>
Subject: Re: [PATCH] Export irq tracepoints for use by kernel modules

On Tue, Apr 22, 2014 at 03:26:13PM +0100, Christoph Hellwig wrote:
> On Tue, Apr 22, 2014 at 07:24:20AM -0700, Drew Richardson wrote:
> > After commit de7b2973903c6cc50b31ee5682a69b2219b9919d ("tracepoint:
> > Use struct pointer instead of name hash for reg/unreg tracepoints"),
> > any tracepoints used in a kernel module must be exported.
> 
> How does this matter given that there aren't any modular users?

Gator (http://git.linaro.org/arm/ds5/gator.git), an out of tree kernel
module, uses irq_handler_exit and softirq_exit. I thought it would be
helpful to export the other tracepoints from trace/events/irq.h in
case other users encountered a similar issue.

Drew
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