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When affinity changes cause an increase of the number of CPUs allowed for tasks which are related to a MM, that might results in a situation where the ownership mode can go back from per CPU mode to per task mode. As affinity changes happen with runqueue lock held there is no way to do the actual mode change and required fixup right there. Add the infrastructure to defer it to a workqueue. The scheduled work can race with a fork() or exit(). Whatever happens first takes care of it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://patch.msgid.link/20251119172550.216484739@linutronix.de |
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| README | ||
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.