Embedded Linux slides: PREEMPT_RT updates

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

slides/sysdev-realtime/sysdev-realtime.tex

@@ -513,7 +513,7 @@ \subsection{Setting up PREEMPT\_RT}
     kernel
     \begin{itemize}
     \item Only the latest and long term stable releases of the kernel
-      are actively supported and maintained, currently: 5.11, 5.10, 5.4, 4.19,
+      are actively supported and maintained, currently: 5.12, 5.10, 5.4, 4.19,
       4.14, 4.9, 4.4. This is yet another advantage of using a mainline
       LTS kernel release! It will be difficult to port the patches to
       other kernel versions.
@@ -551,9 +551,9 @@ \subsection{Setting up PREEMPT\_RT}
   \frametitle{PREEMPT\_RT mainlining status (1)}
   \begin{itemize}
   \item The project is making good progress since it got funding from
-        the Linux Foundation in 2015.
-  \item However, a reduction of the size of the PREEMPT\_RT patchset
-        is not really visible yet:\\
+        the Linux Foundation in 2015 (Linux version 4.1 at that time).
+  \item We can now observe a slow but steady a reduction of the size of
+        the PREEMPT\_RT patchset:\\
     \vfill
     \includegraphics[width=0.8\textwidth]{slides/sysdev-realtime/rt-patch-sizes.png}
   \end{itemize}
@@ -569,6 +569,9 @@ \subsection{Setting up PREEMPT\_RT}
         \kconfig{CONFIG_PREEMPT_RT} configuration option is now in mainline, though
         it cannot be selected yet (missing dependencies). This
         simplifies further mainlining work.
+  \item In 5.12, new \kconfig{CONFIG_PREEMPT_DYNAMIC} switch to change the preemption
+        model at boot time: \code{preempt=none}, \code{preempt=voluntary} or
+        \code{preempt=full}
   \item See the latest news on \url{https://wiki.linuxfoundation.org/realtime/}
   \end{itemize}
 \end{frame}