Adding upstream version 5.10.209.upstream/5.10.209

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

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+.. SPDX-License-Identifier: GPL-2.0
+
+
+.. The Linux Kernel documentation master file, created by
+   sphinx-quickstart on Fri Feb 12 13:51:46 2016.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+.. _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.
+
+Licensing documentation
+-----------------------
+
+The following describes the license of the Linux kernel source code
+(GPLv2), how to properly mark the license of individual files in the source
+tree, as well as links to the full license text.
+
+* :ref:`kernel_licensing`
+
+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.
+
+.. toctree::
+   :maxdepth: 2
+
+   admin-guide/index
+   kbuild/index
+
+Firmware-related documentation
+------------------------------
+The following holds information on the kernel's expectations regarding the
+platform firmwares.
+
+.. toctree::
+   :maxdepth: 2
+
+   firmware-guide/index
+   devicetree/index
+
+Application-developer documentation
+-----------------------------------
+
+The user-space API manual gathers together documents describing aspects of
+the kernel interface as seen by application developers.
+
+.. toctree::
+   :maxdepth: 2
+
+   userspace-api/index
+
+
+Introduction to kernel development
+----------------------------------
+
+These manuals contain overall information about how to develop the kernel.
+The kernel community is quite large, with thousands of developers
+contributing over the course of a year.  As with any large community,
+knowing how things are done will make the process of getting your changes
+merged much easier.
+
+.. toctree::
+   :maxdepth: 2
+
+   process/index
+   dev-tools/index
+   doc-guide/index
+   kernel-hacking/index
+   trace/index
+   maintainer/index
+   fault-injection/index
+   livepatch/index
+
+
+Kernel API documentation
+------------------------
+
+These books get into the details of how specific kernel subsystems work
+from the point of view of a kernel developer.  Much of the information here
+is taken directly from the kernel source, with supplemental material added
+as needed (or at least as we managed to add it — probably *not* all that is
+needed).
+
+.. toctree::
+   :maxdepth: 2
+
+   driver-api/index
+   core-api/index
+   locking/index
+   accounting/index
+   block/index
+   cdrom/index
+   cpu-freq/index
+   ide/index
+   fb/index
+   fpga/index
+   hid/index
+   i2c/index
+   iio/index
+   isdn/index
+   infiniband/index
+   leds/index
+   netlabel/index
+   networking/index
+   pcmcia/index
+   power/index
+   target/index
+   timers/index
+   spi/index
+   w1/index
+   watchdog/index
+   virt/index
+   input/index
+   hwmon/index
+   gpu/index
+   security/index
+   sound/index
+   crypto/index
+   filesystems/index
+   vm/index
+   bpf/index
+   usb/index
+   PCI/index
+   scsi/index
+   misc-devices/index
+   scheduler/index
+   mhi/index
+
+Architecture-agnostic documentation
+-----------------------------------
+
+.. toctree::
+   :maxdepth: 2
+
+   asm-annotations
+
+Architecture-specific documentation
+-----------------------------------
+
+These books provide programming details about architecture-specific
+implementation.
+
+.. toctree::
+   :maxdepth: 2
+
+   arm/index
+   arm64/index
+   ia64/index
+   m68k/index
+   mips/index
+   nios2/nios2
+   openrisc/index
+   parisc/index
+   powerpc/index
+   riscv/index
+   s390/index
+   sh/index
+   sparc/index
+   x86/index
+   xtensa/index
+
+Filesystem Documentation
+------------------------
+
+The documentation in this section are provided by specific filesystem
+subprojects.
+
+.. toctree::
+   :maxdepth: 2
+
+   filesystems/ext4/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: 2
+
+   staging/index
+   watch_queue
+
+
+Translations
+------------
+
+.. toctree::
+   :maxdepth: 2
+
+   translations/index
+
+Indices and tables
+==================
+
+* :ref:`genindex`