linux-kernel - Re: [-mm PATCH] register_memory/unregister

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Date:	Mon, 11 Feb 2008 11:48:18 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Badari Pulavarty <pbadari@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, greg@...ah.com, haveblue@...ibm.com,
	linux-mm@...ck.org
Subject: Re: [-mm PATCH] register_memory/unregister_memory clean ups

On Mon, 11 Feb 2008 09:23:18 -0800
Badari Pulavarty <pbadari@...ibm.com> wrote:

> Hi Andrew,
> 
> While testing hotplug memory remove against -mm, I noticed
> that unregister_memory() is not cleaning up /sysfs entries
> correctly. It also de-references structures after destroying
> them (luckily in the code which never gets used). So, I cleaned
> up the code and fixed the extra reference issue.
> 
> Could you please include it in -mm ?
> 
> Thanks,
> Badari
> 
> register_memory()/unregister_memory() never gets called with
> "root". unregister_memory() is accessing kobject_name of
> the object just freed up. Since no one uses the code,
> lets take the code out. And also, make register_memory() static.  
> 
> Another bug fix - before calling unregister_memory()
> remove_memory_block() gets a ref on kobject. unregister_memory()
> need to drop that ref before calling sysdev_unregister().
> 

I'd say this:

> Subject: [-mm PATCH] register_memory/unregister_memory clean ups

is rather tame.  These are more than cleanups!  These sound like
machine-crashing bugs.  Do they crash machines?  How come nobody noticed
it?

All very strange...


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