linux-kernel - Re: [patch] Re: [perf] Finding uninstalled modules Was Re: mailing list for trace users

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Date:	Wed, 23 Sep 2009 16:52:28 +0200
From:	Mike Galbraith <efault@....de>
To:	Avi Kivity <avi@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>, rostedt@...dmis.org,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [patch] Re: [perf] Finding uninstalled modules Was Re: mailing
 list for trace users

On Wed, 2009-09-23 at 17:39 +0300, Avi Kivity wrote:
> On 09/23/2009 05:09 PM, Mike Galbraith wrote:
> >
> >> Mine says:
> >>
> >>     kernel/arch/x86/kvm/kvm.ko:
> >>     kernel/arch/x86/kvm/kvm-intel.ko: kernel/arch/x86/kvm/kvm.ko
> >>
> >> Which is reasonable for /lib/modules/2.6.31, not for a source directory.
> >>      
> > Yup, there's the problem.  The code assumes that the path to modules.dep
> > and the path stored in modules.dep will agree.
> >
> > Wants some robustification.
> >    
> 
> The trace shows modules.dep was picked up from /lib/modules/2.6.31, so 
> if it continued that and picked up the modules from the same place, 
> everything would work.  Why does it try to pick up the modules from cwd?

I don't know where that cwd is coming from off the top of my head.

The symbol loading code reads the path stored in modules.dep, and chops
at ':'.

> >>      open("kernel/arch/x86/kvm/kvm-intel.ko", O_RDONLY) = -1 ENOENT (No
...
> Mine says:
> 
>    kernel/arch/x86/kvm/kvm.ko:
>    kernel/arch/x86/kvm/kvm-intel.ko: kernel/arch/x86/kvm/kvm.ko

	-Mike

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