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sched_ext: idle: Fix return code of scx_select_cpu_dfl()

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Return -EBUSY when using %SCX_PICK_IDLE_CORE with scx_select_cpu_dfl()
if a fully idle SMT core cannot be found, instead of falling back to
@prev_cpu, which is not a fully idle SMT core in this case.

Fixes: c414c2171c ("sched_ext: idle: Honor idle flags in the built-in idle selection policy")
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Andrea Righi 2025-03-26 20:18:49 +01:00 committed by Tejun Heo
parent f6e0150b20
commit 37477d9eca
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/ext_idle.c
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@ -544,7 +544,7 @@ s32 scx_select_cpu_dfl(struct task_struct *p, s32 prev_cpu, u64 wake_flags, u64
* core.
*/
if (flags & SCX_PICK_IDLE_CORE) {
cpu = prev_cpu;
cpu = -EBUSY;
goto out_unlock;
}
}