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Date:	Wed, 19 Dec 2012 16:44:08 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Xiaotian Feng <xtfeng@...il.com>, akpm@...ux-foundation.org,
	Xiaotian Feng <dannyfeng@...cent.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: fix inconsistent lock state

On Wed, Dec 19, 2012 at 04:13:30AM -0800, Eric W. Biederman wrote:

> Something doesn't feel right.   I don't think there should be a path where we get to proc_free_inum from bh context.
> 
> Rcu callbacks should be running in process context (if a special one).

No, they are not.  They run from softirq context, which makes for all kinds
of interesting kludges being required in various places.
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