linux-kernel - systemtap broken by removal of register_timer

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Message-ID: <20130403075017.GA2534@suse.de>
Date:	Wed, 3 Apr 2013 08:50:17 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	SystemTap <systemtap@...rceware.org>
Subject: systemtap broken by removal of register_timer_hook

Commit ba6fdda4 (profiling: Remove unused timer hook) removed
[un]register_timer_hook due to a lack of upstream users and a belief
that there were no out-of-tree users. However, systemtap uses it and
with that patch applied, some stap scripts fail with

WARNING: "unregister_timer_hook" [/tmp/stapJoLMxD/stap_de6e19eaf7bd94629aba9d6f56cdfca5_8156.ko] undefined!
WARNING: "register_timer_hook" [/tmp/stapJoLMxD/stap_de6e19eaf7bd94629aba9d6f56cdfca5_8156.ko] undefined!
Error inserting module '/tmp/stapJoLMxD/stap_de6e19eaf7bd94629aba9d6f56cdfca5_8156.ko': Unknown symbol in module
WARNING: /usr/bin/staprun exited with status: 1
Pass 5: run failed.  Try again with another '--vp 00001' option.
Unexpected exit of STAP script at ./watch-dstate.pl line 305.

Can the patch be reverted or at least put a warning in place about it
being obsoleted until the systemtap folks come up with a replacement?

Systemtap folk, has his problem already been addressed?

-- 
Mel Gorman
SUSE Labs
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