linux-kernel - [tip:sched/core] sched: Fix initialization of sched_domain

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Message-ID: <tip-a925d012722620476cd63593e39628513a4c174c@git.kernel.org>
Date:	Mon, 19 May 2014 06:09:05 -0700
From:	tip-bot for Vincent Guittot <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	jet.chen@...el.com, peterz@...radead.org,
	vincent.guittot@...aro.org, tglx@...utronix.de
Subject: [tip:sched/core] sched:
  Fix initialization of sched_domain_topology for NUMA

Commit-ID:  a925d012722620476cd63593e39628513a4c174c
Gitweb:     http://git.kernel.org/tip/a925d012722620476cd63593e39628513a4c174c
Author:     Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate: Tue, 13 May 2014 11:11:01 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 19 May 2014 22:02:41 +0900

sched: 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.

Cc: fengguang.wu@...el.com
Cc: mingo@...nel.org
Reported-by: Jet Chen <jet.chen@...el.com>
Tested-by: Jet Chen <jet.chen@...el.com>
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1399972261-25693-1-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 29c542e..ca76cc6 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;
--
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