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

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Message-ID: <CA+5PVA7TFXdK-KjbwUtqMPF6=Ot1yhKycg5naV6N_gALWVN7cg@mail.gmail.com>
Date:	Tue, 22 Apr 2014 11:01:03 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Drew Richardson <drew.richardson@....com>,
	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>, mathieu.desnoyers@...icios.com
Subject: Re: [PATCH] Export irq tracepoints for use by kernel modules

On Tue, Apr 22, 2014 at 10:26 AM, Christoph Hellwig <hch@...radead.org> 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?

We had a bug report about this breaking systemtap type usage[1].  In
there, Matthieu suggested that the new for_each_kernel_tracepoint
interface be used.

Drew, it would have been proper to CC the author of the change you're
referencing on all of your patches to export these symbols.

josh

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1087623
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