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=-3.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=ham 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 E8095C2BCA1 for ; Sat, 8 Jun 2019 02:19:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B4BAC212F5 for ; Sat, 8 Jun 2019 02:19:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="jeSEWFa9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729883AbfFHCT3 (ORCPT ); Fri, 7 Jun 2019 22:19:29 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:56274 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728860AbfFHCT3 (ORCPT ); Fri, 7 Jun 2019 22:19:29 -0400 Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x582JSvB030663 for ; Fri, 7 Jun 2019 19:19:28 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=facebook; bh=GbaFTvpyFTq1p954+8DIE9YJjCQ9LlKHadFwEpT85EM=; b=jeSEWFa9ubLz50agGk8a/QgNHYe/SGPxDqmkEGvwUJtqqGlduCJBq9zSnRPrQW14ckcw 7DCG1hQuhF9W6WUQQfDGji4jcL6fmQRFMuhhVYqbAC1bYbt/fQjZtW7LF+Fac0c3p6rd H/d10AynSUvjtvwTCl6LBEfM/d8/bmFEaso= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2t00xjresc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT) for ; Fri, 07 Jun 2019 19:19:28 -0700 Received: from mx-out.facebook.com (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::128) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5; Fri, 7 Jun 2019 19:19:27 -0700 Received: by devvm3632.prn2.facebook.com (Postfix, from userid 172007) id 52AD4CE318F4; Fri, 7 Jun 2019 19:19:27 -0700 (PDT) Smtp-Origin-Hostprefix: devvm From: Hechao Li Smtp-Origin-Hostname: devvm3632.prn2.facebook.com To: CC: , , , , Hechao Li Smtp-Origin-Cluster: prn2c23 Subject: [PATCH v5 bpf-next 0/2] bpf: Add a new API libbpf_num_possible_cpus() Date: Fri, 7 Jun 2019 19:19:23 -0700 Message-ID: <20190608021925.4060095-1-hechaol@fb.com> X-Mailer: git-send-email 2.17.1 X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-08_01:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=13 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=743 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906080015 X-FB-Internal: deliver Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Archived-At: List-Archive: List-Post: Getting number of possible CPUs is commonly used for per-CPU BPF maps and perf_event_maps. Add a new API libbpf_num_possible_cpus() that helps user with per-CPU related operations and remove duplicate implementations in bpftool and selftests. v2: Save errno before calling pr_warning in case it is changed. v3: Make sure libbpf_num_possible_cpus never returns 0 so that user only has to check if ret value < 0. v4: Fix error code when reading 0 bytes from possible CPU file. v5: Fix selftests compliation issue. Hechao Li (2): bpf: add a new API libbpf_num_possible_cpus() bpf: use libbpf_num_possible_cpus in bpftool and selftests tools/bpf/bpftool/common.c | 53 +++--------------------- tools/lib/bpf/libbpf.c | 57 ++++++++++++++++++++++++++ tools/lib/bpf/libbpf.h | 16 ++++++++ tools/lib/bpf/libbpf.map | 1 + tools/testing/selftests/bpf/bpf_util.h | 37 +++-------------- 5 files changed, 84 insertions(+), 80 deletions(-) -- 2.17.1