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Scheduler fix:

Browse Source 
- Avoid false positive migration warning for proxy donors
    (Andrea Righi)
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fix from Ingo Molnar:

 - Avoid false positive migration warning for proxy donors
   (Andrea Righi)

* tag 'sched-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/core: Avoid false migration warning for proxy donors
This commit is contained in:
Linus Torvalds 2026-09-20 09:37:27 -07:00
commit fecbe78ac0
1 changed files with 8 additions and 1 deletions
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9
kernel/sched/core.c
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@ -3351,6 +3351,8 @@ void relax_compatible_cpus_allowed_ptr(struct task_struct *p)
void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
{
unsigned int state = READ_ONCE(p->__state);
bool proxy_migrated = sched_proxy_exec() && p->is_blocked &&
task_cpu(p) != p->wake_cpu;
/*
* We should never call set_task_cpu() on a blocked task,
@ -3386,7 +3388,12 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
*/
WARN_ON_ONCE(!cpu_online(new_cpu));
WARN_ON_ONCE(is_migration_disabled(p));
/*
* Proxy execution can move a blocked task's scheduling context to any
* CPU without moving its migration-disabled execution context. The
* wakeup path will return the task to a CPU where it can execute.
*/
WARN_ON_ONCE(is_migration_disabled(p) && !proxy_migrated);
trace_sched_migrate_task(p, new_cpu);