Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.. SPDX-License-Identifier: GPL-2.0
+
+.. _linux_doc:
+
+==============================
+The Linux Kernel documentation
+==============================
+
+This is the top level of the kernel's documentation tree.  Kernel
+documentation, like the kernel itself, is very much a work in progress;
+that is especially true as we work to integrate our many scattered
+documents into a coherent whole.  Please note that improvements to the
+documentation are welcome; join the linux-doc list at vger.kernel.org if
+you want to help out.
+
+Working with the development community
+======================================
+
+The essential guides for interacting with the kernel's development
+community and getting your work upstream.
+
+.. toctree::
+   :maxdepth: 1
+
+   process/development-process
+   process/submitting-patches
+   Code of conduct <process/code-of-conduct>
+   maintainer/index
+   All development-process docs <process/index>
+
+
+Internal API manuals
+====================
+
+Manuals for use by developers working to interface with the rest of the
+kernel.
+
+.. toctree::
+   :maxdepth: 1
+
+   core-api/index
+   driver-api/index
+   subsystem-apis
+   Locking in the kernel <locking/index>
+
+Development tools and processes
+===============================
+
+Various other manuals with useful information for all kernel developers.
+
+.. toctree::
+   :maxdepth: 1
+
+   process/license-rules
+   doc-guide/index
+   dev-tools/index
+   dev-tools/testing-overview
+   kernel-hacking/index
+   trace/index
+   fault-injection/index
+   livepatch/index
+   rust/index
+
+
+User-oriented documentation
+===========================
+
+The following manuals are written for *users* of the kernel — those who are
+trying to get it to work optimally on a given system and application
+developers seeking information on the kernel's user-space APIs.
+
+.. toctree::
+   :maxdepth: 1
+
+   admin-guide/index
+   The kernel build system <kbuild/index>
+   admin-guide/reporting-issues.rst
+   User-space tools <tools/index>
+   userspace-api/index
+
+See also: the `Linux man pages <https://www.kernel.org/doc/man-pages/>`_,
+which are kept separately from the kernel's own documentation.
+
+Firmware-related documentation
+==============================
+The following holds information on the kernel's expectations regarding the
+platform firmwares.
+
+.. toctree::
+   :maxdepth: 1
+
+   firmware-guide/index
+   devicetree/index
+
+
+Architecture-specific documentation
+===================================
+
+.. toctree::
+   :maxdepth: 2
+
+   arch/index
+
+
+Other documentation
+===================
+
+There are several unsorted documents that don't seem to fit on other parts
+of the documentation body, or may require some adjustments and/or conversion
+to ReStructured Text format, or are simply too old.
+
+.. toctree::
+   :maxdepth: 1
+
+   staging/index
+
+
+Translations
+============
+
+.. toctree::
+   :maxdepth: 2
+
+   translations/index
+
+Indices and tables
+==================
+
+* :ref:`genindex`