linux-kernel - Re: Sysfs attributes racing with unregistration

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Message-ID: <20120104182041.GO31746@google.com>
Date:	Wed, 4 Jan 2012 10:20:41 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: Sysfs attributes racing with unregistration

Hello,

On Wed, Jan 04, 2012 at 01:13:41PM -0500, Alan Stern wrote:
> Now, looking through the code, I wonder why sysfs_{get,put}_active() 
> and sysfs_deactivate() don't use a real rwsem.  Why go to all the 
> effort of imitating one?  Is it just to save space?

Hmmm... maybe there was something which prevented that or maybe I was
just being stupid.  I don't really remember.  Space is a fairly
important consideration too.  Depending on configuration, there can be
a LOT of sysfs_dirents and memory consumption from sysfs has been a
real problem.

Thanks.

-- 
tejun
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