From patchwork Tue Sep 17 12:48:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunsheng Lin X-Patchwork-Id: 11148747 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 46C08912 for ; Tue, 17 Sep 2019 12:51:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2EC4C206C2 for ; Tue, 17 Sep 2019 12:51:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726230AbfIQMv1 (ORCPT ); Tue, 17 Sep 2019 08:51:27 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:55622 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726131AbfIQMv0 (ORCPT ); Tue, 17 Sep 2019 08:51:26 -0400 Received: from DGGEMS403-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 9DDFB6AEE488B1C6EA43; Tue, 17 Sep 2019 20:51:23 +0800 (CST) Received: from localhost.localdomain (10.67.212.75) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.439.0; Tue, 17 Sep 2019 20:51:18 +0800 From: Yunsheng Lin To: , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware Date: Tue, 17 Sep 2019 20:48:54 +0800 Message-ID: <1568724534-146242-1-git-send-email-linyunsheng@huawei.com> X-Mailer: git-send-email 2.8.1 MIME-Version: 1.0 X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org When passing the return value of dev_to_node() to cpumask_of_node() without checking if the device's node id is NUMA_NO_NODE, there is global-out-of-bounds detected by KASAN. From the discussion [1], NUMA_NO_NODE really means no node affinity, which also means all cpus should be usable. So the cpumask_of_node() should always return all cpus online when user passes the node id as NUMA_NO_NODE, just like similar semantic that page allocator handles NUMA_NO_NODE. But we cannot really copy the page allocator logic. Simply because the page allocator doesn't enforce the near node affinity. It just picks it up as a preferred node but then it is free to fallback to any other numa node. This is not the case here and node_to_cpumask_map will only restrict to the particular node's cpus which would have really non deterministic behavior depending on where the code is executed. So in fact we really want to return cpu_online_mask for NUMA_NO_NODE. Also there is a debugging version of node_to_cpumask_map() for x86 and arm64, which is only used when CONFIG_DEBUG_PER_CPU_MAPS is defined, this patch changes it to handle NUMA_NO_NODE as normal node_to_cpumask_map(). [1] https://lore.kernel.org/patchwork/patch/1125789/ Signed-off-by: Yunsheng Lin Suggested-by: Michal Hocko Acked-by: Michal Hocko --- V6: Drop the cpu_all_mask -> cpu_online_mask change for it seems a little controversial, may need deeper investigation, and rebased on the latest linux-next. V5: Drop unsigned "fix" change for x86/arm64, and change comment log according to Michal's comment. V4: Have all these changes in a single patch. V3: Change to only handle NUMA_NO_NODE, and return cpu_online_mask for NUMA_NO_NODE case, and change the commit log to better justify the change. V2: make the node id checking change to other arches too. --- arch/arm64/include/asm/numa.h | 3 +++ arch/arm64/mm/numa.c | 3 +++ arch/mips/include/asm/mach-loongson64/topology.h | 4 +++- arch/s390/include/asm/topology.h | 3 +++ arch/x86/include/asm/topology.h | 3 +++ arch/x86/mm/numa.c | 3 +++ 6 files changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/numa.h b/arch/arm64/include/asm/numa.h index 626ad01..c8a4b31 100644 --- a/arch/arm64/include/asm/numa.h +++ b/arch/arm64/include/asm/numa.h @@ -25,6 +25,9 @@ const struct cpumask *cpumask_of_node(int node); /* Returns a pointer to the cpumask of CPUs on Node 'node'. */ static inline const struct cpumask *cpumask_of_node(int node) { + if (node == NUMA_NO_NODE) + return cpu_online_mask; + return node_to_cpumask_map[node]; } #endif diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c index 4decf16..5ae7eea 100644 --- a/arch/arm64/mm/numa.c +++ b/arch/arm64/mm/numa.c @@ -46,6 +46,9 @@ EXPORT_SYMBOL(node_to_cpumask_map); */ const struct cpumask *cpumask_of_node(int node) { + if (node == NUMA_NO_NODE) + return cpu_online_mask; + if (WARN_ON(node >= nr_node_ids)) return cpu_none_mask; diff --git a/arch/mips/include/asm/mach-loongson64/topology.h b/arch/mips/include/asm/mach-loongson64/topology.h index 7ff819a..e78daa6 100644 --- a/arch/mips/include/asm/mach-loongson64/topology.h +++ b/arch/mips/include/asm/mach-loongson64/topology.h @@ -5,7 +5,9 @@ #ifdef CONFIG_NUMA #define cpu_to_node(cpu) (cpu_logical_map(cpu) >> 2) -#define cpumask_of_node(node) (&__node_data[(node)]->cpumask) +#define cpumask_of_node(node) ((node) == NUMA_NO_NODE ? \ + cpu_online_mask : \ + &__node_data[(node)]->cpumask) struct pci_bus; extern int pcibus_to_node(struct pci_bus *); diff --git a/arch/s390/include/asm/topology.h b/arch/s390/include/asm/topology.h index cca406f..1bd2e73 100644 --- a/arch/s390/include/asm/topology.h +++ b/arch/s390/include/asm/topology.h @@ -78,6 +78,9 @@ static inline int cpu_to_node(int cpu) #define cpumask_of_node cpumask_of_node static inline const struct cpumask *cpumask_of_node(int node) { + if (node == NUMA_NO_NODE) + return cpu_online_mask; + return &node_to_cpumask_map[node]; } diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index 4b14d23..7fa82e1 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -69,6 +69,9 @@ extern const struct cpumask *cpumask_of_node(int node); /* Returns a pointer to the cpumask of CPUs on Node 'node'. */ static inline const struct cpumask *cpumask_of_node(int node) { + if (node == NUMA_NO_NODE) + return cpu_online_mask; + return node_to_cpumask_map[node]; } #endif diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index 4123100e..9859acb 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -861,6 +861,9 @@ void numa_remove_cpu(int cpu) */ const struct cpumask *cpumask_of_node(int node) { + if (node == NUMA_NO_NODE) + return cpu_online_mask; + if ((unsigned)node >= nr_node_ids) { printk(KERN_WARNING "cpumask_of_node(%d): (unsigned)node >= nr_node_ids(%u)\n",