On 8/16/24 04:27, Chen Ridong wrote:
Both fetch_xcpus and user_xcpus functions are used to retrieve the value
of exclusive_cpus. If exclusive_cpus is not set, cpus_allowed is the
implicit value used as exclusive in a local partition. I can not imagine
a scenario where effective_xcpus is not empty when exclusive_cpus is
empty. Therefore, I suggest removing the fetch_xcpus function.
Signed-off-by: Chen Ridong <chenridong@xxxxxxxxxx>
---
kernel/cgroup/cpuset.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index fdd5346616d3..8be0259065f5 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -771,13 +771,6 @@ static inline bool xcpus_empty(struct cpuset *cs)
cpumask_empty(cs->exclusive_cpus);
}
-static inline struct cpumask *fetch_xcpus(struct cpuset *cs)
-{
- return !cpumask_empty(cs->exclusive_cpus) ? cs->exclusive_cpus :
- cpumask_empty(cs->effective_xcpus) ? cs->cpus_allowed
- : cs->effective_xcpus;
-}
-
/*
* cpusets_are_exclusive() - check if two cpusets are exclusive
*
@@ -785,8 +778,8 @@ static inline struct cpumask *fetch_xcpus(struct cpuset *cs)
*/
static inline bool cpusets_are_exclusive(struct cpuset *cs1, struct cpuset *cs2)
{
- struct cpumask *xcpus1 = fetch_xcpus(cs1);
- struct cpumask *xcpus2 = fetch_xcpus(cs2);
+ struct cpumask *xcpus1 = user_xcpus(cs1);
+ struct cpumask *xcpus2 = user_xcpus(cs2);
if (cpumask_intersects(xcpus1, xcpus2))
return false;
@@ -2585,7 +2578,7 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
invalidate = true;
rcu_read_lock();
cpuset_for_each_child(cp, css, parent) {
- struct cpumask *xcpus = fetch_xcpus(trialcs);
+ struct cpumask *xcpus = user_xcpus(trialcs);
if (is_partition_valid(cp) &&
cpumask_intersects(xcpus, cp->effective_xcpus)) {
LGTM.
Reviewed-by: Waiman Long <longman@xxxxxxxxxx>
