linux-kernel - Re: [PATCH] cred: remove const qualifiers

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Message-ID: <5816.1219325052@redhat.com>
Date:	Thu, 21 Aug 2008 14:24:12 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	dhowells@...hat.com, Harvey Harrison <harvey.harrison@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cred: remove const qualifiers

Andrew Morton <akpm@...ux-foundation.org> wrote:

> That information should have been included in a code comment.

It was explained in the covering note:

	Subject: [PATCH 00/24] Introduce credentials [ver #7]
	...
	 (c) task_struct::cred is a const struct cred *, as are all pointers
	     that aren't used specifically for creating new credentials.  This
	     catches places that are changing creds when they shouldn't be at
	     compile time.

	     To get a new ref on a const cred, use get_cred() which casts away
	     the const and calls atomic_inc().

It should've gone in the log entry for the "CRED: Inaugurate COW credentials"
patch and also into the documentation.  I don't know whether I can amend the
former, but I can amend the latter.  I'll also amend the comment to make it
crystal clear.

David
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