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sched/fair: Take the scheduling domain into account in select_idle_smt()
When picking a CPU on task wakeup, select_idle_smt() has to take into account the scheduling domain of @target. This is because the "isolcpus" kernel command line option can remove CPUs from the domain to isolate them from other SMT siblings. This fix checks if the candidate CPU is in the target scheduling domain. Commit: df3cb4e ("sched/fair: Fix wrong cpu selecting from isolated domain") ... originally introduced this fix by adding the check of the scheduling domain in the loop. However, commit: 3e6efe8 ("sched/fair: Remove redundant check in select_idle_smt()") ... accidentally removed the check. Bring it back. Fixes: 3e6efe8 ("sched/fair: Remove redundant check in select_idle_smt()") Signed-off-by: Keisuke Nishimura <[email protected]> Signed-off-by: Julia Lawall <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Reviewed-by: Vincent Guittot <[email protected]> Link: https://lore.kernel.org/r/[email protected]
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