From patchwork Mon Jun 12 09:07:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 13276035 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 18A67C7EE2E for ; Mon, 12 Jun 2023 09:56:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235675AbjFLJ4H (ORCPT ); Mon, 12 Jun 2023 05:56:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32898 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233682AbjFLJyr (ORCPT ); Mon, 12 Jun 2023 05:54:47 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C9764C1E; Mon, 12 Jun 2023 02:39:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=VwLJzq4wQCJ4xfIoCm0MOddWikggSaLNbFpG3XgsB1U=; b=dDnxyA36tfL2pJa+fjQ2VTeARz uh5lFYPphgrzEScOZBiNSB/l0JET6lz9vuFxdA8IjoxWv//Mx3BL1bDtn1P4YIMrpV/FRB35iPjRQ S/2hc5m9oTCtV65ICDia0XlNp2GJ0x2OKDtdrc7GG+LtRuBqj2191E0uWBwd1NiC6XGa9rjhVrcph ZKoLG6i5q8+lBORMXKkBhDQwET2tp7pp2axVFoU3Tu0b7dxGOs6WD1mFYQPYjDOIn9x8uoZZFJBye DG5AK1uryNKX7xiUVquINqYQD8O0H4yN8nueL4W+D6yuGI4G4JIeE0rBu/zP8xN1C128nOvfhbHfZ MmQ71Gaw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1q8e0o-008kRE-01; Mon, 12 Jun 2023 09:39:03 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 4DD6E3033CE; Mon, 12 Jun 2023 11:38:53 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id E135130A77B73; Mon, 12 Jun 2023 11:38:48 +0200 (CEST) Message-ID: <20230612093540.493651920@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:07:54 +0200 From: Peter Zijlstra To: torvalds@linux-foundation.org, keescook@chromium.org, gregkh@linuxfoundation.org, pbonzini@redhat.com Cc: masahiroy@kernel.org, nathan@kernel.org, ndesaulniers@google.com, nicolas@fjasle.eu, catalin.marinas@arm.com, will@kernel.org, vkoul@kernel.org, trix@redhat.com, ojeda@kernel.org, peterz@infradead.org, mingo@redhat.com, longman@redhat.com, boqun.feng@gmail.com, dennis@kernel.org, tj@kernel.org, cl@linux.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, paulmck@kernel.org, frederic@kernel.org, quic_neeraju@quicinc.com, joel@joelfernandes.org, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, rientjes@google.com, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, apw@canonical.com, joe@perches.com, dwaipayanray1@gmail.com, lukas.bulwahn@gmail.com, john.johansen@canonical.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, llvm@lists.linux.dev, linux-perf-users@vger.kernel.org, rcu@vger.kernel.org, linux-security-module@vger.kernel.org, tglx@linutronix.de, ravi.bangoria@amd.com, error27@gmail.com, luc.vanoostenryck@gmail.com Subject: [PATCH v3 41/57] perf: Simplify __perf_event_output() References: <20230612090713.652690195@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7739,22 +7739,17 @@ __perf_event_output(struct perf_event *e int err; /* protect the callchain buffers */ - rcu_read_lock(); + guard(rcu)(); perf_prepare_sample(data, event, regs); perf_prepare_header(&header, data, event, regs); - err = output_begin(&handle, data, event, header.size); if (err) - goto exit; - + return err; perf_output_sample(&handle, &header, data, event); - perf_output_end(&handle); -exit: - rcu_read_unlock(); - return err; + return 0; } void