From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f170.google.com (mail-pf0-f170.google.com [209.85.192.170]) by kanga.kvack.org (Postfix) with ESMTP id D30826B0253 for ; Sun, 14 Feb 2016 17:48:53 -0500 (EST) Received: by mail-pf0-f170.google.com with SMTP id e127so76865429pfe.3 for ; Sun, 14 Feb 2016 14:48:53 -0800 (PST) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id 82si38512516pfn.23.2016.02.14.14.48.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 14 Feb 2016 14:48:53 -0800 (PST) From: Greg Kroah-Hartman Subject: [PATCH 4.3 156/200] sched: Fix crash in sched_init_numa() Date: Sun, 14 Feb 2016 14:22:43 -0800 Message-Id: <20160214222223.033623423@linuxfoundation.org> In-Reply-To: <20160214222217.084543173@linuxfoundation.org> References: <20160214222217.084543173@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jan Stancek , Raghavendra K T , gkurz@linux.vnet.ibm.com, grant.likely@linaro.org, nikunj@linux.vnet.ibm.com, vdavydov@parallels.com, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, peterz@infradead.org, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, anton@samba.org, Ingo Molnar 4.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Raghavendra K T commit 9c03ee147193645be4c186d3688232fa438c57c7 upstream. The following PowerPC commit: c118baf80256 ("arch/powerpc/mm/numa.c: do not allocate bootmem memory for non existing nodes") avoids allocating bootmem memory for non existent nodes. But when DEBUG_PER_CPU_MAPS=y is enabled, my powerNV system failed to boot because in sched_init_numa(), cpumask_or() operation was done on unallocated nodes. Fix that by making cpumask_or() operation only on existing nodes. [ Tested with and w/o DEBUG_PER_CPU_MAPS=y on x86 and PowerPC. ] Reported-by: Jan Stancek Tested-by: Jan Stancek Signed-off-by: Raghavendra K T Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Link: http://lkml.kernel.org/r/1452884483-11676-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- kernel/sched/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6678,7 +6678,7 @@ static void sched_init_numa(void) sched_domains_numa_masks[i][j] = mask; - for (k = 0; k < nr_node_ids; k++) { + for_each_node(k) { if (node_distance(j, k) > sched_domains_numa_distance[i]) continue; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org