This is a note to let you know that I've just added the patch titled
sched: Fix crash in sched_init_numa()
to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sched-fix-crash-in-sched_init_numa.patch
and it can be found in the queue-4.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9c03ee147193645be4c186d3688232fa438c57c7 Mon Sep 17 00:00:00 2001
From: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
Date: Sat, 16 Jan 2016 00:31:23 +0530
Subject: sched: Fix crash in sched_init_numa()
From: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxx>
Tested-by: Jan Stancek <jstancek@xxxxxxxxxx>
Signed-off-by: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
Cc: <gkurz@xxxxxxxxxxxxxxxxxx>
Cc: <grant.likely@xxxxxxxxxx>
Cc: <nikunj@xxxxxxxxxxxxxxxxxx>
Cc: <vdavydov@xxxxxxxxxxxxx>
Cc: <linuxppc-dev@xxxxxxxxxxxxxxxx>
Cc: <linux-mm@xxxxxxxxx>
Cc: <peterz@xxxxxxxxxxxxx>
Cc: <benh@xxxxxxxxxxxxxxxxxxx>
Cc: <paulus@xxxxxxxxx>
Cc: <mpe@xxxxxxxxxxxxxx>
Cc: <anton@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1452884483-11676-1-git-send-email-raghavendra.kt@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
Patches currently in stable-queue which might be from raghavendra.kt@xxxxxxxxxxxxxxxxxx are
queue-4.3/sched-fix-crash-in-sched_init_numa.patch
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