From mboxrd@z Thu Jan 1 00:00:00 1970 From: Harvey Harrison Subject: [PATCHv4 6/6] byteorder: add copy_{endian} helpers Date: Mon, 02 Jun 2008 10:37:24 -0700 Message-ID: <1212428244.11008.40.camel@brick> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from yw-out-2324.google.com ([74.125.46.30]:37656 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755481AbYFBRhi (ORCPT ); Mon, 2 Jun 2008 13:37:38 -0400 Received: by yw-out-2324.google.com with SMTP id 9so562126ywe.1 for ; Mon, 02 Jun 2008 10:37:32 -0700 (PDT) Sender: linux-arch-owner@vger.kernel.org List-ID: To: Andrew Morton Cc: linux-arch , Russell King , "tony.luck" Add helpers for the idiom: *(__le16 *)ptr = cpu_to_le16(val); Can now be written as: copy_le16(ptr, val); Implemented as macros to allow val to be byteswapped at compile-time when it is a constant. Signed-off-by: Harvey Harrison --- include/linux/byteorder.h | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/include/linux/byteorder.h b/include/linux/byteorder.h index b4713ce..8d3c847 100644 --- a/include/linux/byteorder.h +++ b/include/linux/byteorder.h @@ -278,6 +278,17 @@ static inline __be64 __cpu_to_be64p(const __u64 *p) # define htons(x) ___htons(x) # define ntohs(x) ___ntohs(x) +/* + * Defined as macros to allow constant folding of the cpu_to_XXXX when + * possible. + */ +#define copy_le16(ptr, val) (*(__le16 *)(ptr) = cpu_to_le16((u16)(val));) +#define copy_le32(ptr, val) (*(__le32 *)(ptr) = cpu_to_le32((u32)(val));) +#define copy_le64(ptr, val) (*(__le64 *)(ptr) = cpu_to_le64((u64)(val));) +#define copy_be16(ptr, val) (*(__be16 *)(ptr) = cpu_to_be16((u16)(val));) +#define copy_be32(ptr, val) (*(__be32 *)(ptr) = cpu_to_be32((u32)(val));) +#define copy_be64(ptr, val) (*(__be64 *)(ptr) = cpu_to_be64((u64)(val));) + static inline void le16_add_cpu(__le16 *var, u16 val) { *var = cpu_to_le16(le16_to_cpup(var) + val); -- 1.5.6.rc0.277.g804cf