Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933073AbcCJXdz (ORCPT ); Thu, 10 Mar 2016 18:33:55 -0500 Received: from mga04.intel.com ([192.55.52.120]:40159 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932902AbcCJXcX (ORCPT ); Thu, 10 Mar 2016 18:32:23 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,317,1455004800"; d="scan'208";a="761983465" From: Vikas Shivappa To: vikas.shivappa@intel.com, vikas.shivappa@linux.intel.com Cc: linux-kernel@vger.kernel.org, x86@kernel.org, hpa@zytor.com, tglx@linutronix.de, mingo@kernel.org, peterz@infradead.org, ravi.v.shankar@intel.com, tony.luck@intel.com, fenghua.yu@intel.com, h.peter.anvin@intel.com Subject: [PATCH 2/6] x86/perf/intel/cqm: Fix cqm memory leak and notifier leak Date: Thu, 10 Mar 2016 15:32:08 -0800 Message-Id: <1457652732-4499-3-git-send-email-vikas.shivappa@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1457652732-4499-1-git-send-email-vikas.shivappa@linux.intel.com> References: <1457652732-4499-1-git-send-email-vikas.shivappa@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2445 Lines: 99 Fixes the hotcpu notifier leak and other global variable memory leaks during cqm(cache quality of service monitoring) initialization. Reviewed-by: Tony Luck Signed-off-by: Vikas Shivappa --- arch/x86/kernel/cpu/perf_event_intel_cqm.c | 43 ++++++++++++++++++++++-------- 1 file changed, 32 insertions(+), 11 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event_intel_cqm.c b/arch/x86/kernel/cpu/perf_event_intel_cqm.c index e6be335..fc704ed 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_cqm.c +++ b/arch/x86/kernel/cpu/perf_event_intel_cqm.c @@ -211,6 +211,20 @@ static void __put_rmid(u32 rmid) list_add_tail(&entry->list, &cqm_rmid_limbo_lru); } +static void cqm_cleanup(void) +{ + int i; + + if (!cqm_rmid_ptrs) + return; + + for (i = 0; i < cqm_max_rmid; i++) + kfree(cqm_rmid_ptrs[i]); + + kfree(cqm_rmid_ptrs); + cqm_rmid_ptrs = NULL; +} + static int intel_cqm_setup_rmid_cache(void) { struct cqm_rmid_entry *entry; @@ -218,7 +232,7 @@ static int intel_cqm_setup_rmid_cache(void) int r = 0; nr_rmids = cqm_max_rmid + 1; - cqm_rmid_ptrs = kmalloc(sizeof(struct cqm_rmid_entry *) * + cqm_rmid_ptrs = kzalloc(sizeof(struct cqm_rmid_entry *) * nr_rmids, GFP_KERNEL); if (!cqm_rmid_ptrs) return -ENOMEM; @@ -249,11 +263,9 @@ static int intel_cqm_setup_rmid_cache(void) mutex_unlock(&cache_mutex); return 0; -fail: - while (r--) - kfree(cqm_rmid_ptrs[r]); - kfree(cqm_rmid_ptrs); +fail: + cqm_cleanup(); return -ENOMEM; } @@ -1322,7 +1334,7 @@ static const struct x86_cpu_id intel_cqm_match[] = { static int __init intel_cqm_init(void) { - char *str, scale[20]; + char *str = NULL, scale[20]; int i, cpu, ret; if (!x86_match_cpu(intel_cqm_match)) @@ -1382,16 +1394,25 @@ static int __init intel_cqm_init(void) cqm_pick_event_reader(i); } - __perf_cpu_notifier(intel_cqm_cpu_notifier); - ret = perf_pmu_register(&intel_cqm_pmu, "intel_cqm", -1); - if (ret) + if (ret) { pr_err("Intel CQM perf registration failed: %d\n", ret); - else - pr_info("Intel CQM monitoring enabled\n"); + goto out; + } + + pr_info("Intel CQM monitoring enabled\n"); + /* + * Register the hot cpu notifier once we are sure cqm + * is enabled to avoid notifier leak. + */ + __perf_cpu_notifier(intel_cqm_cpu_notifier); out: cpu_notifier_register_done(); + if (ret) { + kfree(str); + cqm_cleanup(); + } return ret; } -- 1.9.1