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Commitcac5cefbad("sched/smp: Make SMP unconditional") migrate_disable() even on UP builds. Commit06ddd17521("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
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.