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sched: Fix crash in sched_init_numa() 

The following PowerPC commit:

  c118baf802 ("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@redhat.com>
Tested-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: <gkurz@linux.vnet.ibm.com>
Cc: <grant.likely@linaro.org>
Cc: <nikunj@linux.vnet.ibm.com>
Cc: <vdavydov@parallels.com>
Cc: <linuxppc-dev@lists.ozlabs.org>
Cc: <linux-mm@kvack.org>
Cc: <peterz@infradead.org>
Cc: <benh@kernel.crashing.org>
Cc: <paulus@samba.org>
Cc: <mpe@ellerman.id.au>
Cc: <anton@samba.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@kernel.org>
steinar/wifi_calib_4_9_kernel
Raghavendra K T 2016-01-16 00:31:23 +05:30 committed by Ingo Molnar
parent 10a0c0f059
commit 9c03ee1471
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/core.c
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@ -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;