Adding upstream version 5.10.209.upstream/5.10.209upstream

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

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+===============================
+The Linux Kernel Tracepoint API
+===============================
+
+:Author: Jason Baron
+:Author: William Cohen
+
+Introduction
+============
+
+Tracepoints are static probe points that are located in strategic points
+throughout the kernel. 'Probes' register/unregister with tracepoints via
+a callback mechanism. The 'probes' are strictly typed functions that are
+passed a unique set of parameters defined by each tracepoint.
+
+From this simple callback mechanism, 'probes' can be used to profile,
+debug, and understand kernel behavior. There are a number of tools that
+provide a framework for using 'probes'. These tools include Systemtap,
+ftrace, and LTTng.
+
+Tracepoints are defined in a number of header files via various macros.
+Thus, the purpose of this document is to provide a clear accounting of
+the available tracepoints. The intention is to understand not only what
+tracepoints are available but also to understand where future
+tracepoints might be added.
+
+The API presented has functions of the form:
+``trace_tracepointname(function parameters)``. These are the tracepoints
+callbacks that are found throughout the code. Registering and
+unregistering probes with these callback sites is covered in the
+``Documentation/trace/*`` directory.
+
+IRQ
+===
+
+.. kernel-doc:: include/trace/events/irq.h
+   :internal:
+
+SIGNAL
+======
+
+.. kernel-doc:: include/trace/events/signal.h
+   :internal:
+
+Block IO
+========
+
+.. kernel-doc:: include/trace/events/block.h
+   :internal:
+
+Workqueue
+=========
+
+.. kernel-doc:: include/trace/events/workqueue.h
+   :internal: