linux-kernel - [PATCH] Fix: PowerNV crash with 4.4.0-rc8 at sched_init

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Message-Id: <1452884483-11676-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com>
Date:	Sat, 16 Jan 2016 00:31:23 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	<mingo@...hat.com>, <peterz@...radead.org>,
	<benh@...nel.crashing.org>, <paulus@...ba.org>,
	<mpe@...erman.id.au>, <anton@...ba.org>,
	<akpm@...ux-foundation.org>
Cc:	<jstancek@...hat.com>, <gkurz@...ux.vnet.ibm.com>,
	<grant.likely@...aro.org>, <nikunj@...ux.vnet.ibm.com>,
	<vdavydov@...allels.com>, <raghavendra.kt@...ux.vnet.ibm.com>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>
Subject: [PATCH] Fix: PowerNV crash with 4.4.0-rc8 at sched_init_numa

Commit c118baf80256 ("arch/powerpc/mm/numa.c: do not allocate bootmem
memory for non existing nodes") avoided bootmem memory allocation for
non existent nodes.

When DEBUG_PER_CPU_MAPS enabled, 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 on x86 and powerpc ]

Reported-by: Jan Stancek <jstancek@...hat.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 44253ad..474658b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6840,7 +6840,7 @@ 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;
 
-- 
1.7.11.7