linux-kernel - [PATCH 4.3 156/200] sched: Fix crash in sched_init

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Date:	Sun, 14 Feb 2016 14:22:43 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jan Stancek <jstancek@...hat.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	gkurz@...ux.vnet.ibm.com, grant.likely@...aro.org,
	nikunj@...ux.vnet.ibm.com, vdavydov@...allels.com,
	linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
	peterz@...radead.org, benh@...nel.crashing.org, paulus@...ba.org,
	mpe@...erman.id.au, anton@...ba.org, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 4.3 156/200] sched: Fix crash in sched_init_numa()

4.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>

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 <jstancek@...hat.com>
Tested-by: Jan Stancek <jstancek@...hat.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc: <gkurz@...ux.vnet.ibm.com>
Cc: <grant.likely@...aro.org>
Cc: <nikunj@...ux.vnet.ibm.com>
Cc: <vdavydov@...allels.com>
Cc: <linuxppc-dev@...ts.ozlabs.org>
Cc: <linux-mm@...ck.org>
Cc: <peterz@...radead.org>
Cc: <benh@...nel.crashing.org>
Cc: <paulus@...ba.org>
Cc: <mpe@...erman.id.au>
Cc: <anton@...ba.org>
Link: http://lkml.kernel.org/r/1452884483-11676-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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;