linux-kernel - Documentation/credentials.txt

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Date:	Fri, 23 Apr 2010 18:55:33 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	David Howells <dhowells@...hat.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Documentation/credentials.txt

Hi,

In the section 'ACCESSING ANOTHER TASK'S CREDENTIALS', the file
Documentation/credentials.txt says:

> A function need not get RCU read lock to use __task_cred() if it is holding a
> spinlock at the time as this implicitly holds the RCU read lock.

AIUI, that is not actually right any more, is it?  A spinlock does not
suffice as it does not necessarily imply an RCU read-side critical section
(anymore).  Of course the spinlock specifically protecting updates would
suffice, but that's not what this is saying.

Am I way off base?

thanks,
-serge
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