Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751620AbaFJJht (ORCPT ); Tue, 10 Jun 2014 05:37:49 -0400 Received: from mail-pa0-f53.google.com ([209.85.220.53]:56848 "EHLO mail-pa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750921AbaFJJhq (ORCPT ); Tue, 10 Jun 2014 05:37:46 -0400 From: Zhouyi Zhou To: , , , , , , , Cc: Zhouyi Zhou , Zhouyi Zhou Subject: [RFC PATCH] perf/amd: Try to fix some mem allocation failure handling Date: Tue, 10 Jun 2014 17:37:09 +0800 Message-Id: <1402393029-11561-1-git-send-email-zhouzhouyi@gmail.com> X-Mailer: git-send-email 1.7.10.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is version 2.0 of "[PATCH 1/1] perf/amd: NULL return of kzalloc_node should be handled" (http://www.spinics.net/lists/kernel/msg1760689.html), Try to correctly handle mem allocation failure in perf_event_amd_uncore.c Signed-off-by: Zhouyi Zhou --- arch/x86/kernel/cpu/perf_event_amd_uncore.c | 36 ++++++++++++++++++++++++--- 1 file changed, 33 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event_amd_uncore.c b/arch/x86/kernel/cpu/perf_event_amd_uncore.c index 3bbdf4c..bdc8e49 100644 --- a/arch/x86/kernel/cpu/perf_event_amd_uncore.c +++ b/arch/x86/kernel/cpu/perf_event_amd_uncore.c @@ -294,12 +294,14 @@ static struct amd_uncore *amd_uncore_alloc(unsigned int cpu) cpu_to_node(cpu)); } -static void amd_uncore_cpu_up_prepare(unsigned int cpu) +static int amd_uncore_cpu_up_prepare(unsigned int cpu) { struct amd_uncore *uncore; if (amd_uncore_nb) { uncore = amd_uncore_alloc(cpu); + if (!uncore) + return 1; uncore->cpu = cpu; uncore->num_counters = NUM_COUNTERS_NB; uncore->rdpmc_base = RDPMC_BASE_NB; @@ -311,6 +313,11 @@ static void amd_uncore_cpu_up_prepare(unsigned int cpu) if (amd_uncore_l2) { uncore = amd_uncore_alloc(cpu); + if (!uncore) { + if (amd_uncore_nb) + kfree(*per_cpu_ptr(amd_uncore_nb, cpu)); + return 1; + } uncore->cpu = cpu; uncore->num_counters = NUM_COUNTERS_L2; uncore->rdpmc_base = RDPMC_BASE_L2; @@ -319,6 +326,8 @@ static void amd_uncore_cpu_up_prepare(unsigned int cpu) uncore->pmu = &amd_l2_pmu; *per_cpu_ptr(amd_uncore_l2, cpu) = uncore; } + + return 0; } static struct amd_uncore * @@ -461,7 +470,8 @@ amd_uncore_cpu_notifier(struct notifier_block *self, unsigned long action, switch (action & ~CPU_TASKS_FROZEN) { case CPU_UP_PREPARE: - amd_uncore_cpu_up_prepare(cpu); + if (amd_uncore_cpu_up_prepare(cpu)) + return notifier_from_errno(-ENOMEM), break; case CPU_STARTING: @@ -514,6 +524,8 @@ static int __init amd_uncore_init(void) if (cpu_has_perfctr_nb) { amd_uncore_nb = alloc_percpu(struct amd_uncore *); + if (!amd_uncore_nb) + return -ENOMEM; perf_pmu_register(&amd_nb_pmu, amd_nb_pmu.name, -1); printk(KERN_INFO "perf: AMD NB counters detected\n"); @@ -522,6 +534,13 @@ static int __init amd_uncore_init(void) if (cpu_has_perfctr_l2) { amd_uncore_l2 = alloc_percpu(struct amd_uncore *); + if (!amd_uncore_l2) { + if (cpu_has_perfctr_nb) { + perf_pmu_unregister(&amd_nb_pmu); + free_percpu(amd_uncore_nb); + } + return -ENOMEM; + } perf_pmu_register(&amd_l2_pmu, amd_l2_pmu.name, -1); printk(KERN_INFO "perf: AMD L2I counters detected\n"); @@ -535,7 +554,18 @@ static int __init amd_uncore_init(void) /* init cpus already online before registering for hotplug notifier */ for_each_online_cpu(cpu) { - amd_uncore_cpu_up_prepare(cpu); + if (amd_uncore_cpu_up_prepare(cpu)) { + if (cpu_has_perfctr_nb) { + perf_pmu_unregister(&amd_nb_pmu); + free_percpu(amd_uncore_nb); + } + if (cpu_has_perfctr_l2) { + perf_pmu_unregister(&amd_l2_pmu); + free_percpu(amd_uncore_l2); + } + cpu_notifier_register_done(); + return -ENOMEM; + } smp_call_function_single(cpu, init_cpu_already_online, NULL, 1); } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/