From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 29B7D18AF0 for ; Mon, 12 Jun 2023 09:45:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=+L1iRMB4nmmwqwHgVqKFu6YfCZFh/nRXnBwlrRSlD8U=; b=l5xj7YGzJ9MdhjON14EglYylfb EUJR7pTy41tsIuQd/y8kaQMmrJ9fElXhiqo9DWPGQdbTysXorMONJYbUV32badyMRfJ6FtwpAqm8q MrRCCUwayKttRKiybuscWI0p2QeD1tB1bFl2j3WWcLoF0X3lf3CXo5QJNxmDbKinDGBeOyfmOnCmE /X8HQXxGnjIJh6P2iSVevWCVPQOR2KEMRITnwTM+axmnZ04Qca94zWTCsbQuzm8vouhn1vucYwRPz ikxH7Y5hIrYuhlASOvPFvUPLPcwK+A7TojGeBVZRwTm0dLa6sZ1kwP6vqSDQ3x01lzmRoAfM1wG2Q uh+mWrGQ==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1q8e0l-002NBG-Hh; Mon, 12 Jun 2023 09:38:55 +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 184DF303189; Mon, 12 Jun 2023 11:38:53 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 7AB6530A77B60; Mon, 12 Jun 2023 11:38:48 +0200 (CEST) Message-ID: <20230612093539.228708854@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:07:37 +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 24/57] perf: Simplify perf_pmu_register() error path References: <20230612090713.652690195@infradead.org> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 The error path of perf_pmu_register() is of course very similar to a subset of perf_pmu_unregister(). Extract this common part in __perf_pmu_unregister() and simplify things. Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 51 ++++++++++++++++++++++++--------------------------- 1 file changed, 24 insertions(+), 27 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -11426,20 +11426,35 @@ static int pmu_dev_alloc(struct pmu *pmu static struct lock_class_key cpuctx_mutex; static struct lock_class_key cpuctx_lock; +static void __perf_pmu_unregister(struct pmu *pmu) +{ + free_percpu(pmu->pmu_disable_count); + if (pmu->type >= 0) + idr_remove(&pmu_idr, pmu->type); + if (pmu_bus_running && pmu->dev && pmu->dev != PMU_NULL_DEV) { + if (pmu->nr_addr_filters) + device_remove_file(pmu->dev, &dev_attr_nr_addr_filters); + device_del(pmu->dev); + put_device(pmu->dev); + } + free_pmu_context(pmu); +} + int perf_pmu_register(struct pmu *pmu, const char *name, int type) { int cpu, ret, max = PERF_TYPE_MAX; + pmu->type = -1; + mutex_lock(&pmus_lock); ret = -ENOMEM; pmu->pmu_disable_count = alloc_percpu(int); if (!pmu->pmu_disable_count) goto unlock; - pmu->type = -1; if (WARN_ONCE(!name, "Can not register anonymous pmu.\n")) { ret = -EINVAL; - goto free_pdc; + goto free; } pmu->name = name; @@ -11449,23 +11464,22 @@ int perf_pmu_register(struct pmu *pmu, c ret = idr_alloc(&pmu_idr, pmu, max, 0, GFP_KERNEL); if (ret < 0) - goto free_pdc; + goto free; WARN_ON(type >= 0 && ret != type); - type = ret; - pmu->type = type; + pmu->type = ret; if (pmu_bus_running && !pmu->dev) { ret = pmu_dev_alloc(pmu); if (ret) - goto free_idr; + goto free; } ret = -ENOMEM; pmu->cpu_pmu_context = alloc_percpu(struct perf_cpu_pmu_context); if (!pmu->cpu_pmu_context) - goto free_dev; + goto free; for_each_possible_cpu(cpu) { struct perf_cpu_pmu_context *cpc; @@ -11511,17 +11525,8 @@ int perf_pmu_register(struct pmu *pmu, c return ret; -free_dev: - if (pmu->dev && pmu->dev != PMU_NULL_DEV) { - device_del(pmu->dev); - put_device(pmu->dev); - } - -free_idr: - idr_remove(&pmu_idr, pmu->type); - -free_pdc: - free_percpu(pmu->pmu_disable_count); +free: + __perf_pmu_unregister(pmu); goto unlock; } EXPORT_SYMBOL_GPL(perf_pmu_register); @@ -11538,15 +11543,7 @@ void perf_pmu_unregister(struct pmu *pmu synchronize_srcu(&pmus_srcu); synchronize_rcu(); - free_percpu(pmu->pmu_disable_count); - idr_remove(&pmu_idr, pmu->type); - if (pmu_bus_running && pmu->dev && pmu->dev != PMU_NULL_DEV) { - if (pmu->nr_addr_filters) - device_remove_file(pmu->dev, &dev_attr_nr_addr_filters); - device_del(pmu->dev); - put_device(pmu->dev); - } - free_pmu_context(pmu); + __perf_pmu_unregister(pmu); mutex_unlock(&pmus_lock); } EXPORT_SYMBOL_GPL(perf_pmu_unregister);