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SPIs are specially annpying, as they can be activated on a CPU and deactivated on another. WHich means that when an SPI is in flight anywhere, all CPUs need to have their TDIR trap bit set. This translates into broadcasting an IPI across all CPUs to make sure they set their trap bit, The number of in-flight SPIs is kept in an atomic variable so that CPUs can turn the trap bit off as soon as possible. Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://msgid.link/20251120172540.2267180-32-maz@kernel.org Signed-off-by: Oliver Upton <oupton@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 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.