From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932458AbXJLJIJ (ORCPT ); Fri, 12 Oct 2007 05:08:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755553AbXJLJHW (ORCPT ); Fri, 12 Oct 2007 05:07:22 -0400 Received: from mx1.redhat.com ([66.187.233.31]:41671 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754929AbXJLJHR (ORCPT ); Fri, 12 Oct 2007 05:07:17 -0400 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells Subject: [PATCH 01/31] Add an ERR_CAST() macro to complement ERR_PTR and co. [try #4] To: torvalds@osdl.org, akpm@osdl.org Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, dhowells@redhat.com Date: Fri, 12 Oct 2007 10:07:14 +0100 Message-ID: <20071012090714.3442.75644.stgit@warthog.procyon.org.uk> In-Reply-To: <20071012090709.3442.69133.stgit@warthog.procyon.org.uk> References: <20071012090709.3442.69133.stgit@warthog.procyon.org.uk> User-Agent: StGIT/0.13 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Add an ERR_CAST() macro to complement ERR_PTR and co. for the purposes of casting an error entyped as one pointer type to an error of another pointer type whilst making it explicit as to what is going on. This provides a replacement for the ERR_PTR(PTR_ERR(p)) construct. Signed-off-by: David Howells --- include/linux/err.h | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/include/linux/err.h b/include/linux/err.h index 1ab1d44..08409cd 100644 --- a/include/linux/err.h +++ b/include/linux/err.h @@ -34,6 +34,18 @@ static inline long IS_ERR(const void *ptr) return IS_ERR_VALUE((unsigned long)ptr); } +/** + * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type + * @ptr: The pointer to cast. + * + * Explicitly cast an error-valued pointer to another pointer type in such a + * way as to make it clear that's what's going on. + */ +static inline void *ERR_CAST(const void *ptr) +{ + return (void *) ptr; +} + #endif #endif /* _LINUX_ERR_H */