linux-kernel - Re: [PATCH 2/2] Refine mutex and rcu method in module.c, kernel<3.2.9>

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Message-ID: <4F5ACE2A.2030807@gmail.com>
Date:	Sat, 10 Mar 2012 11:44:42 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	"Chen, Dennis (SRDC SW)" <Dennis1.Chen@....com>
CC:	"jbaron@...hat.com" <jbaron@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] Refine mutex and rcu method in module.c, kernel<3.2.9>

On 03/08/2012 12:48 AM, Chen, Dennis (SRDC SW) wrote:
> Adding dynamic debug maintainer -- Jason Baron...
>
> -----Original Message-----
> From: Chen, Dennis (SRDC SW)
> Sent: Wednesday, March 07, 2012 10:57 PM
> To: linux-kernel@...r.kernel.org
> Cc: Chen, Dennis (SRDC SW)
> Subject: [PATCH 2/2] Refine mutex and rcu method in module.c, kernel<3.2.9>
>
> 1. Add protection code for module_bug_list readers
> 2. Add a new module_bug_mutex as the mutex of the module_bug_list writers

Take a look at the comments in the code:

         /*
          * Strictly speaking this should have a spinlock to protect against
          * traversals, but since we only traverse on BUG()s, a spinlock
          * could potentially lead to deadlock and thus be 
counter-productive.
          */


module_find_bug() is called in a dying path...
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