From patchwork Sat Aug 28 05:20:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Marchevsky X-Patchwork-Id: 12463265 X-Patchwork-Delegate: bpf@iogearbox.net 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=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 1BC8CC4320E for ; Sat, 28 Aug 2021 05:20:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6F2B60EBC for ; Sat, 28 Aug 2021 05:20:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232523AbhH1FV0 (ORCPT ); Sat, 28 Aug 2021 01:21:26 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:10980 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232874AbhH1FVU (ORCPT ); Sat, 28 Aug 2021 01:21:20 -0400 Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 17S5BSZv019527 for ; Fri, 27 Aug 2021 22:20:30 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=ggS2YXj1zpYNXrAy5OVy51eWkVxG9q9EVk6h1JnHn8U=; b=PpMPUV/mMTsB5RFPtNlN1vUGMZY4FRiff2a0QY1BP+s3dDPGI60lLivwIcji8bKxKfvx R5eZWLsRPSneh6VtXjsbJP9JbT+KAetxZjEGzQ4vvG/c5SDYxvUGTtQtcaufoasVcMvR GHUllh5CBOml3kFItRhpkn5e+3uotR2tmQg= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 3apfpfterk-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 27 Aug 2021 22:20:30 -0700 Received: from intmgw002.25.frc3.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Fri, 27 Aug 2021 22:20:29 -0700 Received: by devbig030.frc3.facebook.com (Postfix, from userid 158236) id 56E2E5BF0E32; Fri, 27 Aug 2021 22:20:23 -0700 (PDT) From: Dave Marchevsky To: CC: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Yonghong Song , , Dave Marchevsky Subject: [PATCH v3 bpf-next 4/7] libbpf: use static const fmt string in __bpf_printk Date: Fri, 27 Aug 2021 22:20:03 -0700 Message-ID: <20210828052006.1313788-5-davemarchevsky@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210828052006.1313788-1-davemarchevsky@fb.com> References: <20210828052006.1313788-1-davemarchevsky@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-FB-Source: Intern X-Proofpoint-ORIG-GUID: TSSwe-_F6afxu9i3qA_DhINyY7TWDGZd X-Proofpoint-GUID: TSSwe-_F6afxu9i3qA_DhINyY7TWDGZd X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-08-28_01:2021-08-27,2021-08-28 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 phishscore=0 suspectscore=0 clxscore=1015 bulkscore=0 mlxlogscore=972 priorityscore=1501 impostorscore=0 adultscore=0 lowpriorityscore=0 spamscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2108280031 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net The __bpf_printk convenience macro was using a 'char' fmt string holder as it predates support for globals in libbpf. Move to more efficient 'static const char', but provide a fallback to the old way via BPF_NO_GLOBAL_DATA so users on old kernels can still use the macro. Signed-off-by: Dave Marchevsky --- tools/lib/bpf/bpf_helpers.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h index 5f087306cdfe..a1d5ec6f285c 100644 --- a/tools/lib/bpf/bpf_helpers.h +++ b/tools/lib/bpf/bpf_helpers.h @@ -216,10 +216,16 @@ enum libbpf_tristate { ___param, sizeof(___param)); \ }) +#ifdef BPF_NO_GLOBAL_DATA +#define BPF_PRINTK_FMT_TYPE char +#else +#define BPF_PRINTK_FMT_TYPE static const char +#endif + /* Helper macro to print out debug messages */ #define __bpf_printk(fmt, ...) \ ({ \ - char ____fmt[] = fmt; \ + BPF_PRINTK_FMT_TYPE ____fmt[] = fmt; \ bpf_trace_printk(____fmt, sizeof(____fmt), \ ##__VA_ARGS__); \ })