[PATCH 02/13] cpuset: remove fast exit path from remove_tasks_in_empty_cpuset()

From: Tejun Heo
Date: Thu Jan 03 2013 - 16:38:12 EST

The function isn't that hot, the overhead of missing the fast exit is
low, the test itself depends heavily on cgroup internals, and it's
gonna be a hindrance when trying to decouple cpuset locking from
cgroup core. Remove the fast exit path.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
kernel/cpuset.c | 8 --------
1 file changed, 8 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 854b8bf..5372b6f 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1968,14 +1968,6 @@ static void remove_tasks_in_empty_cpuset(struct cpuset *cs)
struct cpuset *parent;

- * The cgroup's css_sets list is in use if there are tasks
- * in the cpuset; the list is empty if there are none;
- * the cs->css.refcnt seems always 0.
- */
- if (list_empty(&cs->css.cgroup->css_sets))
- return;
- /*
* Find its next-highest non-empty parent, (top cpuset
* has online cpus, so can't be empty).

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