The following commit has been merged into the sched/urgent branch of tip:
Commit-ID: 14672f059d83f591afb2ee1fff56858efe055e5a
Gitweb: https://git.kernel.org/tip/14672f059d83f591afb2ee1fff56858efe055e5a
Author: Shrikanth Hegde <sshegde@xxxxxxxxxxxxx>
AuthorDate: Thu, 06 Mar 2025 10:59:53 +05:30
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Thu, 06 Mar 2025 10:21:31 +01:00
sched/deadline: Use online cpus for validating runtime
The ftrace selftest reported a failure because writing -1 to
sched_rt_runtime_us returns -EBUSY. This happens when the possible
CPUs are different from active CPUs.
Active CPUs are part of one root domain, while remaining CPUs are part
of def_root_domain. Since active cpumask is being used, this results in
cpus=0 when a non active CPUs is used in the loop.
Fix it by looping over the online CPUs instead for validating the
bandwidth calculations.
Signed-off-by: Shrikanth Hegde <sshegde@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Reviewed-by: Juri Lelli <juri.lelli@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20250306052954.452005-2-sshegde@xxxxxxxxxxxxx
---
kernel/sched/deadline.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 38e4537..ff4df16 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -3189,7 +3189,7 @@ int sched_dl_global_validate(void)
* value smaller than the currently allocated bandwidth in
* any of the root_domains.
*/
- for_each_possible_cpu(cpu) {
+ for_each_online_cpu(cpu) {
rcu_read_lock_sched();
if (dl_bw_visited(cpu, gen))
|