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lib/smp_processor_id: Make migration check unconditional of SMP

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Commit cac5cefbad ("sched/smp: Make SMP unconditional")
migrate_disable() even on UP builds.
Commit 06ddd17521 ("sched/smp: Always define is_percpu_thread() and
scheduler_ipi()") made is_percpu_thread() check the affinity mask
instead replying always true for UP mask.

As a consequence smp_processor_id() now complains if invoked within a
migrate_disable() section because is_percpu_thread() checks its mask and
the migration check is left out.

Make migration check unconditional of SMP.

Fixes: cac5cefbad ("sched/smp: Make SMP unconditional")
Closes: https://lore.kernel.org/oe-lkp/202507100448.6b88d6f1-lkp@intel.com
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Chen Yu <yu.c.chen@intel.com>
Link: https://lore.kernel.org/r/20250710082748.-DPO1rjO@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2025-07-10 10:27:48 +02:00 • committed by Peter Zijlstra
parent 0b9ca2dcab
commit 2885daf470
1 changed files with 0 additions and 2 deletions
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2
lib/smp_processor_id.c
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@ -22,10 +22,8 @@ unsigned int check_preemption_disabled(const char *what1, const char *what2)
if (is_percpu_thread()) if (is_percpu_thread())
goto out; goto out;
#ifdef CONFIG_SMP
if (current->migration_disabled) if (current->migration_disabled)
goto out; goto out;
#endif
/* /*
* It is valid to assume CPU-locality during early bootup: * It is valid to assume CPU-locality during early bootup: