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charset="utf-8" Wrap cpu_smt_mask() usage with CONFIG_SCHED_SMT to avoid build failures on kernels built without SMT support. Fixes: 2197cecdb02c ("sched_ext: idle: Prioritize idle SMT sibling") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202603221422.XIueJOE9-lkp@int= el.com/ Signed-off-by: Andrea Righi Reviewed-by: Cheng-Yang Chou --- kernel/sched/ext_idle.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sched/ext_idle.c b/kernel/sched/ext_idle.c index d9596427b5aa1..857d8e902b448 100644 --- a/kernel/sched/ext_idle.c +++ b/kernel/sched/ext_idle.c @@ -622,6 +622,7 @@ s32 scx_select_cpu_dfl(struct task_struct *p, s32 prev_= cpu, u64 wake_flags, goto out_unlock; } =20 +#ifdef CONFIG_SCHED_SMT /* * Use @prev_cpu's sibling if it's idle. */ @@ -633,6 +634,7 @@ s32 scx_select_cpu_dfl(struct task_struct *p, s32 prev_= cpu, u64 wake_flags, goto out_unlock; } } +#endif =20 /* * Search for any idle CPU in the same LLC domain. --=20 2.53.0