From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Sun, 16 Nov 2008 04:57:26 +0000 (+0100)
Subject: tracing/ftrace: change the type of the init() callback
X-Git-Tag: v2.6.29-rc1~586^2~56^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c80025a49855b12fa09bb6db71820e3367b1369;p=pandora-kernel.git

tracing/ftrace: change the type of the init() callback

Impact: extend the ->init() method with the ability to fail

This bring a way to know if the initialization of a tracer successed.
A tracer must return 0 on success and a traditional error (ie:
-ENOMEM) if it fails.

If a tracer fails to init, it is free to print a detailed warn. The
tracing api will not and switch to a new tracer will just return the
error from the init callback.

Note: this will be used for the return tracer.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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