6.13-stable review patch. If anyone has any objections, please let me know.
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From: Andrea Righi arighi@nvidia.com
commit 5f52bbf2f6e0997394cf9c449d44e1c80ff4282c upstream.
Introduce a new helper for BPF schedulers to determine whether a task can migrate or not (supporting both SMP and UP systems).
Fixes: e9fe182772dc ("sched_ext: selftests/dsp_local_on: Fix sporadic failures") Signed-off-by: Andrea Righi arighi@nvidia.com Signed-off-by: Tejun Heo tj@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/sched_ext/include/scx/common.bpf.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- a/tools/sched_ext/include/scx/common.bpf.h +++ b/tools/sched_ext/include/scx/common.bpf.h @@ -333,6 +333,17 @@ static __always_inline const struct cpum return (const struct cpumask *)mask; }
+/* + * Return true if task @p cannot migrate to a different CPU, false + * otherwise. + */ +static inline bool is_migration_disabled(const struct task_struct *p) +{ + if (bpf_core_field_exists(p->migration_disabled)) + return p->migration_disabled; + return false; +} + /* rcu */ void bpf_rcu_read_lock(void) __ksym; void bpf_rcu_read_unlock(void) __ksym;