Date: Fri, 6 Sep 2013 10:41:13 -0400
From: Kyle McMartin <kyle@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Dave Jones <davej@redhat.com>, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: ftrace 'failed to modify' bug when loading reiserfs.ko
Message-ID: <20130906144113.GC25882@merlin.infradead.org>
References: <20130906011924.GA7970@redhat.com>
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 <20130906013455.GA10073@redhat.com>
 <20130905214455.101c6347@gandalf.local.home>
 <20130906014859.GB10073@redhat.com>
 <20130905215154.74c55e9a@gandalf.local.home>
 <20130906035827.GA13446@redhat.com>
 <20130906093252.02c748f5@gandalf.local.home>
 <20130906141852.GA18708@redhat.com>
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On Fri, Sep 06, 2013 at 10:24:13AM -0400, Steven Rostedt wrote:
> 
> Is it really safe to load modules that were compiled with different
> options?

Certainly not, offsets can change based on config options.

> Sounds like a failure in the install scripts to me.
> 

Definitely a bug in those scripts, os-prober would need to run before
modules_install, since if $INSTALL_MOD_PATH is the same between config
changes, there's no guarantee the modules are loadable on the running
kernel without a reboot.

--Kyle
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