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sched/deadline: Use online cpus for validating runtime

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[ Upstream commit 14672f059d83f591afb2ee1fff56858efe055e5a ]

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@linux.ibm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://lore.kernel.org/r/20250306052954.452005-2-sshegde@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
This commit is contained in:
Shrikanth Hegde
2025-03-06 10:59:53 +05:30
committed by Ansh
parent 08535b8842
commit 2c125c8564
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/deadline.c
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@@ -2369,7 +2369,7 @@ int sched_dl_global_validate(void)
* cycling on root_domains... Discussion on different/better
* solutions is welcome!
*/
for_each_possible_cpu(cpu) {
for_each_online_cpu(cpu) {
rcu_read_lock_sched();
dl_b = dl_bw_of(cpu);
cpus = dl_bw_cpus(cpu);