linux-kernel - [PATCH] sched: reduce sched_domain

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Message-Id: <1358241318-20168-1-git-send-email-lig.fnst@cn.fujitsu.com>
Date:	Tue, 15 Jan 2013 17:15:18 +0800
From:	liguang <lig.fnst@...fujitsu.com>
To:	mingo@...hat.com, peterz@...radead.org, Morten.Rasmussen@....com,
	linux-kernel@...r.kernel.org
Cc:	liguang <lig.fnst@...fujitsu.com>
Subject: [PATCH] sched: reduce sched_domain_topology space

sched_domain_topology space was allocated by the size
ARRAY_SIZE(default_topology) + sched_domains_numa_levels,
suppose CONFIG_SCHED_SMT, CONFIG_SCHED_MC were y,
"static struct sched_domain_topology_level default_topology[] = {
         { sd_init_SIBLING, cpu_smt_mask, },
         { sd_init_MC, cpu_coregroup_mask, },
         { sd_init_CPU, cpu_cpu_mask, },
         { NULL, },
};"
then, ARRAY_SIZE(default_topology) equals to 4,
default_topology's NULL entry was accounted,
but, the following allocation for other sched_domains_numa_levels
entries was startd at 3(for default_topology[3].init is NULL),
so, 1 entry was forgot.

Signed-off-by: liguang <lig.fnst@...fujitsu.com>
---
 kernel/sched/core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 257002c..6ba5ecf 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6241,7 +6241,7 @@ static void sched_init_numa(void)
 		}
 	}
 
-	tl = kzalloc((ARRAY_SIZE(default_topology) + level) *
+	tl = kzalloc((ARRAY_SIZE(default_topology) + level - 1) *
 			sizeof(struct sched_domain_topology_level), GFP_KERNEL);
 	if (!tl)
 		return;
-- 
1.7.2.5

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