From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 283DFC433EF for ; Fri, 11 Feb 2022 10:25:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348886AbiBKKZO (ORCPT ); Fri, 11 Feb 2022 05:25:14 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:52058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348880AbiBKKZJ (ORCPT ); Fri, 11 Feb 2022 05:25:09 -0500 Received: from pegase2.c-s.fr (pegase2.c-s.fr [93.17.235.10]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3FA93E47; Fri, 11 Feb 2022 02:25:09 -0800 (PST) Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4Jw8rK15wZz9sSL; Fri, 11 Feb 2022 11:25:05 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RVC_5M6K9gs6; Fri, 11 Feb 2022 11:25:05 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4Jw8rJ088Lz9sSM; Fri, 11 Feb 2022 11:25:04 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id E74F28B77E; Fri, 11 Feb 2022 11:25:03 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id avygUaqL76b8; Fri, 11 Feb 2022 11:25:03 +0100 (CET) Received: from PO20335.IDSI0.si.c-s.fr (unknown [192.168.6.91]) by messagerie.si.c-s.fr (Postfix) with ESMTP id A38D28B764; Fri, 11 Feb 2022 11:25:03 +0100 (CET) Received: from PO20335.IDSI0.si.c-s.fr (localhost [127.0.0.1]) by PO20335.IDSI0.si.c-s.fr (8.17.1/8.16.1) with ESMTPS id 21BAOsOZ946508 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 11 Feb 2022 11:24:54 +0100 Received: (from chleroy@localhost) by PO20335.IDSI0.si.c-s.fr (8.17.1/8.17.1/Submit) id 21BAOq8A946507; Fri, 11 Feb 2022 11:24:52 +0100 X-Authentication-Warning: PO20335.IDSI0.si.c-s.fr: chleroy set sender to christophe.leroy@csgroup.eu using -f From: Christophe Leroy To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , "David S. Miller" , Jakub Kicinski Cc: Christophe Leroy , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org Subject: [PATCH 1/2] net: Allow csum_sub() to be provided in arch Date: Fri, 11 Feb 2022 11:24:48 +0100 Message-Id: <0c8eaab8f0685d2a70d125cf876238c70afd4fb6.1644574987.git.christophe.leroy@csgroup.eu> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1644575088; l=989; s=20211009; h=from:subject:message-id; bh=RUCXz7rcwV3vtRjuwGPzOWG1MqwEYlRVJE5g+0Z10T0=; b=eADc4aCLdklo7HvFbLsm7mGATs8mPnBrP4sXzi8ylYEqFq0APBPHpYUY+C3ha30J+ZcvLukGCpHz n6af84NTDAWj2ByZb/YbwA6p1bUFrsK2r9w+YrLcIqegfq86tYCK X-Developer-Key: i=christophe.leroy@csgroup.eu; a=ed25519; pk=HIzTzUj91asvincQGOFx6+ZF5AoUuP9GdOtQChs7Mm0= Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In the same spirit as commit 07064c6e022b ("net: Allow csum_add to be provided in arch"), allow csum_sub() to be provided by arch. The generic implementation of csum_sub() call csum_add() with the complement of the addendum. Some architectures can do it directly. This will also avoid getting several copies of csum_sub() outlined when building with -Os. Signed-off-by: Christophe Leroy --- include/net/checksum.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/net/checksum.h b/include/net/checksum.h index 9badcd5532ef..735d98724145 100644 --- a/include/net/checksum.h +++ b/include/net/checksum.h @@ -62,10 +62,12 @@ static inline __wsum csum_add(__wsum csum, __wsum addend) } #endif +#ifndef HAVE_ARCH_CSUM_SUB static inline __wsum csum_sub(__wsum csum, __wsum addend) { return csum_add(csum, ~addend); } +#endif static inline __sum16 csum16_add(__sum16 csum, __be16 addend) { -- 2.34.1