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authorVincent Guittot <vincent.guittot@linaro.org>2014-05-13 11:11:01 +0200
committerIngo Molnar <mingo@kernel.org>2014-05-22 11:16:29 +0200
commitc515db8cd311ef77b2dc7cbd6b695022655bb0f3 (patch)
treeb3bdc7320f117e3c2b68e2a8ea6eef0892d370ce /kernel
parent8bf21433f38b020c3d8a3805d1d7fb73d7b40c01 (diff)
sched/numa: Fix initialization of sched_domain_topology for NUMA
Jet Chen has reported a kernel panics when booting qemu-system-x86_64 with kvm64 cpu. A panic occured while building the sched_domain. In sched_init_numa, we create a new topology table in which both default levels and numa levels are copied. The last row of the table must have a null pointer in the mask field. The current implementation doesn't add this last row in the computation of the table size. So we add 1 row in the allocation size that will be used as the last row of the table. The kzalloc will ensure that the mask field is NULL. Reported-by: Jet Chen <jet.chen@intel.com> Tested-by: Jet Chen <jet.chen@intel.com> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: fengguang.wu@intel.com Link: http://lkml.kernel.org/r/1399972261-25693-1-git-send-email-vincent.guittot@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a78c5b62a470..45d077ed24fb 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6231,7 +6231,7 @@ static void sched_init_numa(void)
/* Compute default topology size */
for (i = 0; sched_domain_topology[i].mask; i++);
- tl = kzalloc((i + level) *
+ tl = kzalloc((i + level + 1) *
sizeof(struct sched_domain_topology_level), GFP_KERNEL);
if (!tl)
return;