Kernel slides: update memory debugging frameworks

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

slides/kernel-driver-development-memory/kernel-driver-development-memory.tex

@@ -358,20 +358,25 @@ \section{Memory Management}
     \begin{itemize}
     \item Dynamic memory error detector, to find use-after-free and
       out-of-bounds bugs.
-    \item Only available on \code{x86} (64 bit), \code{arm64}, \code{riscv}
-      (64 bit), \code{powerpc} (32 bit), \code{s390} and \code{xtensa} so far
-      (Linux 5.11 status), but will help to improve architecture independent
-      code anyway.
+    \item Available on most archictures
     \item See \kdochtml{dev-tools/kasan} for details.
     \end{itemize}
+  \item \code{KFENCE} ({\em Kernel Electric Fence})
+    \begin{itemize}
+    \item A low overhead alternative to KASAN, trading performance
+	  for precision. Meant to be used in production systems.
+    \item Only available on \code{x86}, \code{arm64} and \code{powerpc}
+          (Linux 5.13 status)
+    \item See \kdochtml{dev-tools/kfence} for details.
+    \end{itemize}
   \item \code{Kmemleak}
     \begin{itemize}
     \item Dynamic checker for memory leaks
     \item This feature is available for all architectures.
     \item See \kdochtml{dev-tools/kmemleak} for details.
     \end{itemize}
   \end{itemize}
-  Both have a significant overhead. Only use them in development!
+  KASAN and Kmemleak have a significant overhead. Only use them in development!
 \end{frame}
 
 \begin{frame}