linux-kernel - Re: [PATCH 2/6] ERR_PTR: add ERR_OR_0

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Message-ID: <20080519055504.GB14902@lst.de>
Date:	Mon, 19 May 2008 07:55:04 +0200
From:	Christoph Hellwig <hch@....de>
To:	Marcin Slusarz <marcin.slusarz@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 2/6] ERR_PTR: add ERR_OR_0_PTR

On Mon, May 19, 2008 at 12:01:07AM +0200, Marcin Slusarz wrote:
> Some codepaths call ERR_PTR with possibly 0 argument, which is not
> a valid errno and rely on conversion from 0 to NULL pointer.
> Add ERR_OR_0_PTR function which accepts errnos and 0 as an argument.

Sorry, no.  ERR_PTR(0) is perfectly valid, you just don't want to return
the actualy value.  E.g. we have a common idiom of:

	some_ptr = ERR_PTR(err);
	if (IS_ERR(some_ptr))
		goto out_handle_err;

and obsfucating this with new syntactic sugar is not a good idea.

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