From nobody Thu Apr 9 07:51:47 2026 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 C1818C43217 for ; Thu, 3 Nov 2022 04:55:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230300AbiKCEzf (ORCPT ); Thu, 3 Nov 2022 00:55:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38958 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230473AbiKCEzW (ORCPT ); Thu, 3 Nov 2022 00:55:22 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6DD417E04 for ; Wed, 2 Nov 2022 21:55:18 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id h9-20020a25e209000000b006cbc4084f2eso1077498ybe.23 for ; Wed, 02 Nov 2022 21:55:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=ZRVFGWePvwNmlXm2BOJFvtaMGSMXy8LREl0rrvfBjVA=; b=esd73Ew1HyHI7NYFtpnPAP9jY/cbc550EHnRTY8Ws6yN4OalaXE9EODfDf/NdUi/lS MY37wQkTs7e5rqXiIPuDVqbRrm84uW8eutX7Gp+H/Ao5NSNjHdhovqInJBCiGgQTFfNt rw0bb/XU1WYVN/2ilg5cPKz62ThFN1HUPfv4dwg8iRygeLv7OqzfNApFDDj/v/iQA6eQ uEn4TQfVYd8H/IzkWqefkA00nNq49wdvmVfBzHp5N76GmXQ9H2l9XCofEXtrCqH+hqgg dFgYuqIHPz8aF++8Vg1hlMtPrVxuYfhNxLhgFeu2ECVu/rJzGmm8pDYYFgHrLSDgWEMm RpBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ZRVFGWePvwNmlXm2BOJFvtaMGSMXy8LREl0rrvfBjVA=; b=qQC+S1tj3Y0gh8SxGQP/RcBYO9xLiP6VuovRZ7GYdHek6q4a20sCSeK9mrIBfpWznn UvRQnVLbj/4en/glnSAprzh0eHWDA4zs/CA2AO39NHlFg8L+cO7p+xribj7AeVOf8Gm/ Y34IXpq22uMYspH5ZKNwooxf4XBucGCIxYWivFU4+pa8udiOKXVz2/rtdQrYGwzpc2PK SQDDrEtELpKyYnBFRCChZVpAq2oRb0+MrSVFkTaUeMiNOJLF6qNFylCxHS9jD8RhY50K zjoOkyw9xAlJ25do5i70INStIb1bttoYzEaFNG3bqL+h4J+PrRm+YSR00PJjLWIlqtxU kD+A== X-Gm-Message-State: ACrzQf1vR3QRkNK7Ehyn6cQHdrivCAfoBULcMav4FivbCPtAg9/OCLgc kEImjDLLfgVB6kq69T6BVI7O93BB5Dlo X-Google-Smtp-Source: AMsMyM4xeZfFWcIYHW7+VZ8bY5fEr0eMPQ3tVpLlB+nDmZ1z/3e6KwT36FpXWpzSq473i2iaq3+ly/BFyBcw X-Received: from irogers.svl.corp.google.com ([2620:15c:2d4:203:8a9d:7f38:6465:2d7b]) (user=irogers job=sendgmr) by 2002:a05:6902:4d:b0:6cb:9135:29d7 with SMTP id m13-20020a056902004d00b006cb913529d7mr23783827ybh.208.1667451318415; Wed, 02 Nov 2022 21:55:18 -0700 (PDT) Date: Wed, 2 Nov 2022 21:54:34 -0700 In-Reply-To: <20221103045437.163510-1-irogers@google.com> Message-Id: <20221103045437.163510-5-irogers@google.com> Mime-Version: 1.0 References: <20221103045437.163510-1-irogers@google.com> X-Mailer: git-send-email 2.38.1.273.g43a17bfeac-goog Subject: [PATCH v1 4/7] perf trace: hello fix libbpf 1.0+ compatibility From: Ian Rogers To: Leo Yan , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Stephane Eranian , Ian Rogers Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Don't use deprecated and now broken map style. Avoid use of tools/perf/include/bpf/bpf.h and use the more regular BPF headers. Switch to raw_syscalls:sys_enter to avoid the evlist being empty and fixing generating output. Signed-off-by: Ian Rogers --- tools/perf/examples/bpf/hello.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/tools/perf/examples/bpf/hello.c b/tools/perf/examples/bpf/hell= o.c index cf3c2fdc7f79..e9080b0df158 100644 --- a/tools/perf/examples/bpf/hello.c +++ b/tools/perf/examples/bpf/hello.c @@ -1,9 +1,27 @@ -#include +// SPDX-License-Identifier: GPL-2.0 +#include +#include =20 -int syscall_enter(openat)(void *args) +struct __bpf_stdout__ { + __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); + __type(key, int); + __type(value, __u32); + __uint(max_entries, __NR_CPUS__); +} __bpf_stdout__ SEC(".maps"); + +#define puts(from) \ + ({ const int __len =3D sizeof(from); \ + char __from[sizeof(from)] =3D from; \ + bpf_perf_event_output(args, &__bpf_stdout__, BPF_F_CURRENT_CPU, \ + &__from, __len & (sizeof(from) - 1)); }) + +struct syscall_enter_args; + +SEC("raw_syscalls:sys_enter") +int sys_enter(struct syscall_enter_args *args) { puts("Hello, world\n"); return 0; } =20 -license(GPL); +char _license[] SEC("license") =3D "GPL"; --=20 2.38.1.273.g43a17bfeac-goog