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| author | Li Zefan <lizefan@huawei.com> | 2013-06-05 13:15:59 +0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-06-06 00:55:14 +0400 |
| commit | a73456f37b9dbc917398387d0cba926b4455b70f (patch) | |
| tree | f719feff0ea9d7d42b0015a4cd388e2f5b072a4b /kernel | |
| parent | 249cc86db7492dc8de1d2eddebc6bcc4ab2a8e9e (diff) | |
| download | linux-a73456f37b9dbc917398387d0cba926b4455b70f.tar.xz | |
cpuset: re-structure update_cpumask() a bit
Check if cpus_allowed is to be changed before calling validate_change().
This won't change any behavior, but later it will allow us to do this:
# mkdir /cpuset/child
# echo $$ > /cpuset/child/tasks /* empty cpuset */
# echo > /cpuset/child/cpuset.cpus /* do nothing, won't fail */
Without this patch, the last operation will fail.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cpuset.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 51f8e1d5a2a9..535dce685eec 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -856,14 +856,15 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs, if (!cpumask_subset(trialcs->cpus_allowed, cpu_active_mask)) return -EINVAL; } - retval = validate_change(cs, trialcs); - if (retval < 0) - return retval; /* Nothing to do if the cpus didn't change */ if (cpumask_equal(cs->cpus_allowed, trialcs->cpus_allowed)) return 0; + retval = validate_change(cs, trialcs); + if (retval < 0) + return retval; + retval = heap_init(&heap, PAGE_SIZE, GFP_KERNEL, NULL); if (retval) return retval; |