linux-kernel - Re: [PATCH] module: debugging check for runaway kthreads

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Message-ID: <87vcmp14qx.fsf@rustcorp.com.au>
Date:	Thu, 01 Mar 2012 12:06:54 +1030
From:	Rusty Russell <rusty@...abs.org>
To:	Dmitry Antipov <dmitry.antipov@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rusty Russell <rusty.russell@...aro.org>,
	linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org,
	patches@...aro.org, Dmitry Antipov <dmitry.antipov@...aro.org>
Subject: Re: [PATCH] module: debugging check for runaway kthreads

On Wed, 29 Feb 2012 19:21:13 +0400, Dmitry Antipov <dmitry.antipov@...aro.org> wrote:
> Debugging option CONFIG_MODULE_KTHREAD_CHECK provides a way to check
> whether all kernel threads created by the module and have used module
> code as a thread worker function are really exited when the module is
> unloaded. The following pseudo-code contains example of an error which
> is likely to be catched with this debugging check:

Nice idea, but that's 101 lines of code, for very little gain.

How about a debug option which unmaps all module pages on removal,
and ensures they don't get reused?  That might catch a multitude of
problems.  And yes, I realize it might be a bigger patch...

Thanks,
Rusty.
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