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Message-Id: <20160214222143.801451886@linuxfoundation.org>
Date: Sun, 14 Feb 2016 14:21:56 -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 4.4 079/117] sched: Fix crash in sched_init_numa()
4.4-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
@@ -6738,7 +6738,7 @@ 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;
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