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sched_ext: Guard cpu_smt_mask() with CONFIG_SCHED_SMT

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Wrap cpu_smt_mask() usage with CONFIG_SCHED_SMT to avoid build failures
on kernels built without SMT support.

Fixes: 2197cecdb0 ("sched_ext: idle: Prioritize idle SMT sibling")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202603221422.XIueJOE9-lkp@intel.com/
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Andrea Righi
2026-03-22 07:51:46 +01:00
committed by Tejun Heo
parent e73b1d7210
commit 63f500c32a
1 changed files with 2 additions and 0 deletions
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2
kernel/sched/ext_idle.c
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@@ -622,6 +622,7 @@ s32 scx_select_cpu_dfl(struct task_struct *p, s32 prev_cpu, u64 wake_flags,
goto out_unlock;
}
#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
/*
* Search for any idle CPU in the same LLC domain.