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| author | Tang Chen <tangchen@cn.fujitsu.com> | 2012-09-25 21:12:30 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-10-05 13:54:46 +0200 |
| commit | 5f7865f3e44db4c73fdc454fb2af40806212a7ca (patch) | |
| tree | 279a1f2588b875019c80e2ae779bd66bb6544137 /kernel | |
| parent | 2b17c545a4cdbbbadcd7f1e9684c2d7db8f085a6 (diff) | |
| download | linux-5f7865f3e44db4c73fdc454fb2af40806212a7ca.tar.bz2 | |
sched: Ensure 'sched_domains_numa_levels' is safe to use in other functions
We should temporarily reset 'sched_domains_numa_levels' to 0 after
it is reset to 'level' in sched_init_numa(). If it fails to allocate
memory for array sched_domains_numa_masks[][], the array will contain
less then 'level' members. This could be dangerous when we use it to
iterate array sched_domains_numa_masks[][] in other functions.
This patch set sched_domains_numa_levels to 0 before initializing
array sched_domains_numa_masks[][], and reset it to 'level' when
sched_domains_numa_masks[][] is fully initialized.
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1348578751-16904-2-git-send-email-tangchen@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index c17747236438..f895fdd32c5b 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6122,6 +6122,17 @@ static void sched_init_numa(void) * numbers. */ + /* + * Here, we should temporarily reset sched_domains_numa_levels to 0. + * If it fails to allocate memory for array sched_domains_numa_masks[][], + * the array will contain less then 'level' members. This could be + * dangerous when we use it to iterate array sched_domains_numa_masks[][] + * in other functions. + * + * We reset it to 'level' at the end of this function. + */ + sched_domains_numa_levels = 0; + sched_domains_numa_masks = kzalloc(sizeof(void *) * level, GFP_KERNEL); if (!sched_domains_numa_masks) return; @@ -6176,6 +6187,8 @@ static void sched_init_numa(void) } sched_domain_topology = tl; + + sched_domains_numa_levels = level; } #else static inline void sched_init_numa(void) |