linux-kernel - Re: [PATCH 2.6.27-rc3 26/29] mdb: export task

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Message-ID: <20080815163916.GB16560@elte.hu>
Date:	Fri, 15 Aug 2008 18:39:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	jmerkey@...fmountaingroup.com
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, jason.wessel@...driver.com
Subject: Re: [PATCH 2.6.27-rc3 26/29] mdb: export task_curr


* jmerkey@...fmountaingroup.com <jmerkey@...fmountaingroup.com> wrote:

> >
> > * jmerkey@...fmountaingroup.com <jmerkey@...fmountaingroup.com> wrote:
> >
> >> > On Thu, Aug 14, 2008 at 9:14 AM,  <jmerkey@...fmountaingroup.com>
> >> wrote:
> >> >> export the task_curr function to the module based kernel debugger to
> >> >> enable
> >> >> process back tracing and state display.
> >> >>
> >> >> Signed-off-by: Jeffrey Vernon Merkey (jmerkey@...fmountaingroup.com)
> >> >>
> >> >> --- a/kernel/sched.c    2008-08-13 14:22:32.000000000 -0600
> >> >> +++ b/kernel/sched.c    2008-08-13 11:56:03.000000000 -0600
> >> >> @@ -1736,6 +1736,9 @@
> >> >>  {
> >> >>        return cpu_curr(task_cpu(p)) == p;
> >> >>  }
> >> >> +#if defined(CONFIG_MDB_MODULE)
> >> >> +EXPORT_SYMBOL_GPL(task_curr);
> >> >> +#endif
> >> >
> >> > We usually don't export symbols conditionally, especially in core
> >> kernel
> >> > code.
> >> >
> >>
> >> Well,then please suggest how a kernel debugger can be module based and
> >> still be able to get this information some other way that's generic
> >> and minimal impact.
> >
> > FYI, there's a built-in kernel debugger in the upstream kernel already:
> > kernel/kgdb.c - and it does not need that export.
> >
> > So if you are interested in kernel debuggers i'd suggest to work with
> > the KGDB folks to extend it with whatever feature-set is missing.
> >
> > They are friendly, very easy to work with and are open to the
> > thousands-of-years-old scientific method of not duplicating effort,
> > working together, going forward gradually, etc.
> >
> > 	Ingo
> >
> 
> Sorry, but I have my own path and direction, [...]

doing things alone is your unalienable personal right, and since thus 
you apparently didnt intend your patch to be included in the Linux 
kernel that's as far as my interest in this as a maintainer goes.

Thanks,

	Ingo
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