linux-kernel - Re: fix rcu annotations noise in cred.h

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Date:	Mon, 08 Aug 2011 13:28:51 +0100
From:	David Howells <dhowells@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	dhowells@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: fix rcu annotations noise in cred.h

Al Viro <viro@...IV.linux.org.uk> wrote:

> task->cred is declared as __rcu, and access to other tasks' ->cred is,
> indeed, protected.  Access to current->cred does not need rcu_dereference()
> at all, since only the task itself can change its ->cred.  sparse, of
> course, has no way of knowing that...

What was the Sparse warning, btw?  You didn't say.  I don't see any warnings,
but it's possible I have a too-old version of Sparse or the wrong config
options?  (Or maybe I just don't know what to look for)

David
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