[PATCH] docs: Hook the RTLA documents into the kernel docs build

[Jonathan Corbet <corbet@lwn.net>]

The RTLA documents were added to Documentation/ but never hooked into the
rest of the docs build, leading to a bunch of warnings like:

  Documentation/tools/rtla/rtla-osnoise.rst: WARNING: document isn't included in any toctree

Add some basic glue to wire these documents into the build so that they are
available with the rest of the rendered docs.  No attempt has been made to
turn the RTLA docs into proper RST files rather than warmed-over man pages;
that is an exercise for the future.

Fixes: d40d48e1f1f2 ("rtla: Add Documentation")
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
---
I'm happy to see this follow the original via the tracing tree, or I can
send it Linusward myself once docs-next catches up with mainline.

 Documentation/index.rst            |  1 +
 Documentation/tools/index.rst      | 18 ++++++++++++++++++
 Documentation/tools/rtla/index.rst | 24 ++++++++++++++++++++++++
 3 files changed, 43 insertions(+)
 create mode 100644 Documentation/tools/index.rst
 create mode 100644 Documentation/tools/rtla/index.rst

diff --git a/Documentation/index.rst b/Documentation/index.rst
index 2b4de3926858..b58692d687f6 100644
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -166,6 +166,7 @@ to ReStructured Text format, or are simply too old.
 .. toctree::
    :maxdepth: 2
 
+   tools/index
    staging/index
    watch_queue
 
diff --git a/Documentation/tools/index.rst b/Documentation/tools/index.rst
new file mode 100644
index 000000000000..18f5f4583996
--- /dev/null
+++ b/Documentation/tools/index.rst
@@ -0,0 +1,18 @@
+============
+Kernel tools
+============
+
+This book covers user-space tools that are shipped with the kernel source;
+more additions are needed here:
+
+.. toctree::
+   :maxdepth: 1
+
+   rtla/index
+
+.. only::  subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`
diff --git a/Documentation/tools/rtla/index.rst b/Documentation/tools/rtla/index.rst
new file mode 100644
index 000000000000..5938009bf4ae
--- /dev/null
+++ b/Documentation/tools/rtla/index.rst
@@ -0,0 +1,24 @@
+================================
+The realtime Linux analysis tool
+================================
+
+RTLA provides a set of tools for the analysis of the kernel's realtime
+behavior on specific hardware.
+
+.. toctree::
+   :maxdepth: 1
+
+   rtla
+   rtla-osnoise
+   rtla-osnoise-hist
+   rtla-osnoise-top
+   rtla-timerlat
+   rtla-timerlat-hist
+   rtla-timerlat-top
+
+.. only::  subproject and html
+
+   Indices
+   =======
+
+   * :ref:`genindex`
-- 
2.34.1