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

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Date:	Mon, 08 Aug 2011 09:18:29 +0100
From:	David Howells <dhowells@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: fix rcu annotations noise in cred.h


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

>  #define current_cred() \
> -	(current->cred)
> +	(*(__force struct cred **)&current->cred)

No.  You've cast away the const.  Please don't do that.

Paul: isn't there some better way of doing this using an RCU wrapper macro?

	#define current_cred() \
		rcu_dereference_protected(current->cred, 1) 

Perhaps?

David
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