From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934045AbbBCLkY (ORCPT ); Tue, 3 Feb 2015 06:40:24 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:34091 "EHLO mailhub1.si.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933691AbbBCLjf (ORCPT ); Tue, 3 Feb 2015 06:39:35 -0500 From: Christophe Leroy To: Benjamin Herrenschmidt , Paul Mackerras , scottwood@freescale.com CC: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Joakim Tjernlund Subject: [PATCH v2 1/2] powerpc32: put csum_tcpudp_magic inline Message-Id: <20150203113927.52DA41A5F13@localhost.localdomain> Date: Tue, 3 Feb 2015 12:39:27 +0100 (CET) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org csum_tcpudp_magic() is only a few instructions, and does not modifies any other register than the returned result. So it is not worth having it as a separate function and suffer function branching and saving of volatile registers. This patch makes it inline by use of the already existing csum_tcpudp_nofold() function. Signed-off-by: Christophe Leroy --- v2: no change arch/powerpc/include/asm/checksum.h | 15 +++++++++++++++ arch/powerpc/lib/checksum_32.S | 16 ---------------- 2 files changed, 15 insertions(+), 16 deletions(-) diff --git a/arch/powerpc/include/asm/checksum.h b/arch/powerpc/include/asm/checksum.h index 8251a3b..cfe806a 100644 --- a/arch/powerpc/include/asm/checksum.h +++ b/arch/powerpc/include/asm/checksum.h @@ -19,6 +19,7 @@ #else extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); +#ifdef __powerpc64__ /* * computes the checksum of the TCP/UDP pseudo-header * returns a 16-bit checksum, already complemented @@ -27,6 +28,7 @@ extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, unsigned short proto, __wsum sum); +#endif /* * computes the checksum of a memory block at buff, length len, @@ -127,6 +129,19 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, #endif } +#ifndef __powerpc64__ +/* + * computes the checksum of the TCP/UDP pseudo-header + * returns a 16-bit checksum, already complemented + */ +static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, + unsigned short len, + unsigned short proto, + __wsum sum) +{ + return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); +} +#endif #endif #endif /* __KERNEL__ */ #endif diff --git a/arch/powerpc/lib/checksum_32.S b/arch/powerpc/lib/checksum_32.S index 7874e8a..6d67e05 100644 --- a/arch/powerpc/lib/checksum_32.S +++ b/arch/powerpc/lib/checksum_32.S @@ -41,22 +41,6 @@ _GLOBAL(ip_fast_csum) blr /* - * Compute checksum of TCP or UDP pseudo-header: - * csum_tcpudp_magic(saddr, daddr, len, proto, sum) - */ -_GLOBAL(csum_tcpudp_magic) - rlwimi r5,r6,16,0,15 /* put proto in upper half of len */ - addc r0,r3,r4 /* add 4 32-bit words together */ - adde r0,r0,r5 - adde r0,r0,r7 - addze r0,r0 /* add in final carry */ - rlwinm r3,r0,16,0,31 /* fold two halves together */ - add r3,r0,r3 - not r3,r3 - srwi r3,r3,16 - blr - -/* * computes the checksum of a memory block at buff, length len, * and adds in "sum" (32-bit) * -- 2.1.0