fix various typos and wrong commands in slides

Fixes for:
- missing variable definition in Makefile
- wrong serial device in kernel parameters
- missing trace-cmd subcmd and wrong parameter (sched_switch is an
  event, not a plugin)
- missing #include in example code
- fix copy&paste leftover

Signed-off-by: Holger Dengler <dengler@linutronix.de>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>

3 files changed, 4 insertions, 5 deletions

diff --git a/kernel-devel/kernel-debugging/pres_kernel-debugging_en.tex b/kernel-devel/kernel-debugging/pres_kernel-debugging_en.tex
index 104d8c4..2a015a7 100644
--- a/kernel-devel/kernel-debugging/pres_kernel-debugging_en.tex
+++ b/kernel-devel/kernel-debugging/pres_kernel-debugging_en.tex
@@ -181,7 +181,7 @@ console=ttyS0,115200
 console=ttyS0,115200n8
 \end{verbatim}
 \begin{verbatim}
-console=ttyAM0,115200
+console=ttyAMA0,115200
 \end{verbatim}
 \end{frame}
 
diff --git a/kernel-devel/kernel-tracing/pres_kernel-tracing_en.tex b/kernel-devel/kernel-tracing/pres_kernel-tracing_en.tex
index 9dcd1e6..4637f24 100644
--- a/kernel-devel/kernel-tracing/pres_kernel-tracing_en.tex
+++ b/kernel-devel/kernel-tracing/pres_kernel-tracing_en.tex
@@ -400,10 +400,8 @@ stack - output, enable or disable kernel stack tracing
 \begin{frame}[fragile]
 \frametitle{trace-cmd: Usage}
 \begin{verbatim}
-# Recording a sched_switch trace
-$ trace-cmd -p sched_switch
-  plugin sched_switch
-Hit Ctrl^C to stop recording
+# Recording a sched_switch trace event
+$ trace-cmd record -e sched_switch
 Hit Ctrl^C to stop recording
 offset=ae000
 [...]
diff --git a/kernel-devel/module-basics/vain/vain.c b/kernel-devel/module-basics/vain/vain.c
index 3c7377f..fcf009e 100644
--- a/kernel-devel/module-basics/vain/vain.c
+++ b/kernel-devel/module-basics/vain/vain.c
@@ -1,3 +1,4 @@
+#include <linux/init.h>
 #include <linux/module.h>
 
 static int __init vain_init(void)