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 X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE183C07E95 for ; Tue, 20 Jul 2021 02:38:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B3D0461164 for ; Tue, 20 Jul 2021 02:38:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344909AbhGTB5u (ORCPT ); Mon, 19 Jul 2021 21:57:50 -0400 Received: from szxga01-in.huawei.com ([45.249.212.187]:7037 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234950AbhGTBmA (ORCPT ); Mon, 19 Jul 2021 21:42:00 -0400 Received: from dggemv711-chm.china.huawei.com (unknown [172.30.72.53]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4GTMm100YfzYdDc; Tue, 20 Jul 2021 10:16:48 +0800 (CST) Received: from dggpemm500005.china.huawei.com (7.185.36.74) by dggemv711-chm.china.huawei.com (10.1.198.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 20 Jul 2021 10:22:34 +0800 Received: from localhost.localdomain (10.69.192.56) by dggpemm500005.china.huawei.com (7.185.36.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 20 Jul 2021 10:22:34 +0800 From: Yunsheng Lin To: , , , CC: , , , , , , , , , , , , Subject: [PATCH v2 1/4] tools headers UAPI: add cache aligning related macro Date: Tue, 20 Jul 2021 10:21:46 +0800 Message-ID: <1626747709-34013-2-git-send-email-linyunsheng@huawei.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1626747709-34013-1-git-send-email-linyunsheng@huawei.com> References: <1626747709-34013-1-git-send-email-linyunsheng@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.56] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggpemm500005.china.huawei.com (7.185.36.74) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ____cacheline_aligned_in_smp macro is needed to avoid cache bouncing in SMP system, which is used in ptr_ring lib. So add the related macro in order to bulid ptr_ring from user space. As SMP_CACHE_BYTES is 64 bytes for arm64 and most of x86 system, so use 64 bytes as the default SMP_CACHE_BYTES if SMP_CACHE_BYTES is not defined. Signed-off-by: Yunsheng Lin --- tools/include/linux/cache.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 tools/include/linux/cache.h diff --git a/tools/include/linux/cache.h b/tools/include/linux/cache.h new file mode 100644 index 0000000..df04307 --- /dev/null +++ b/tools/include/linux/cache.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __TOOLS_LINUX__CACHE_H +#define __TOOLS_LINUX__CACHE_H + +#ifndef CONFIG_SMP +#define CONFIG_SMP 1 +#endif + +#ifndef SMP_CACHE_BYTES +#define SMP_CACHE_BYTES 64 +#endif + +#ifndef ____cacheline_aligned +#define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES))) +#endif + +#ifndef ____cacheline_aligned_in_smp +#ifdef CONFIG_SMP +#define ____cacheline_aligned_in_smp ____cacheline_aligned +#else +#define ____cacheline_aligned_in_smp +#endif /* CONFIG_SMP */ +#endif + +#endif /* __LINUX_CACHE_H */ -- 2.7.4