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[ Upstream commit 56c2cb10120894be40c40a9bf0ce798da14c50f6 ] During CPU-down hotplug, hrtimers may migrate to isolated CPUs, compromising CPU isolation. Address this issue by masking valid CPUs for hrtimers using housekeeping_cpumask(HK_TYPE_TIMER). Suggested-by: Waiman Long <longman@redhat.com> Signed-off-by: Costa Shulyupin <costa.shul@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Waiman Long <longman@redhat.com> Link: https://lore.kernel.org/r/20240222200856.569036-1-costa.shul@redhat.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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 Restructured Text 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.