linux-kernel - timing of module MODULE_STATE

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Message-ID: <20150831000642.GG29756@redhat.com>
Date:	Sun, 30 Aug 2015 20:06:42 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	rusty@...tcorp.com.au
Cc:	linux-kernel@...r.kernel.org
Subject: timing of module MODULE_STATE_COMING notifier

Hi, Rusty -

We just [1] came across your patch [2] from last year (merged into
3.17), wherein the RO/NX mapping settings for module sections were
moved to an earlier point in the module-loading sequence.

That patch also moved the MODULE_STATE_COMING notifier call to
complete_formation(), which is relatively early to its former
do_init_module() call site.  It now precedes the parse_args(),
mod_sysfs_setup(), and trace_module_load() steps.

Was the latter part of the change intended & necessary?  It is
negatively impacting systemtap, which was relying on
MODULE_STATE_COMING being called from a fairly complete module state -
just before the actual initializer function call.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=18889

[2] commit 4982223e51e8ea9d09bb33c8323b5ec1877b2b51
Author: Rusty Russell <rusty@...tcorp.com.au>
Date:   Wed May 14 10:54:19 2014 +0930

- FChE
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