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authorLi Zefan <lizefan@huawei.com>2013-06-05 17:15:59 +0800
committerTejun Heo <tj@kernel.org>2013-06-05 13:55:14 -0700
commita73456f37b9dbc917398387d0cba926b4455b70f (patch)
treef719feff0ea9d7d42b0015a4cd388e2f5b072a4b /kernel/cpuset.c
parent249cc86db7492dc8de1d2eddebc6bcc4ab2a8e9e (diff)
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/cpuset.c')
-rw-r--r--kernel/cpuset.c7
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;