Differences

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--- linux:kernel:kernel_drivers:hello_world [2019/12/14 16:57] – created peter
+++ linux:kernel:kernel_drivers:hello_world [2022/10/08 11:41] (current) – [Load the module] peter
@@ Line 75: / Line 75: @@
 endif
 </file>
+----
+===== Compile the module =====
+<code bash>
+make
+</code>
+displays:
+<code bash>
+make -C /lib/modules/4.15.0-72-generic/build M=/home/peter/prog/kernel/helloworld modules
+make[1]: Entering directory '/usr/src/linux-headers-4.15.0-72-generic'
+  Building modules, stage 2.
+  MODPOST 1 modules
+make[1]: Leaving directory '/usr/src/linux-headers-4.15.0-72-generic'
+</code>
+----
+===== Check the module =====
+<code bash>
+ls hello,ko
+</code>
+displays:
+<code bash>
+hello.ko
+</code>
+----
+===== Load the module =====
+<code bash>
+sudo insmod hello.ko
+</code>
+<WRAP info>
+**NOTE:**  This will not display anything.
+</WRAP>
+----
+===== Check if the module is loaded =====
+<code bash>
+lsmod
+</code>
+returns:
+<code bash>
+Module                  Size  Used by
+hello                  16384  0
+....
+</code>
+----
+===== Check message from module =====
+As mentioned above when the module was loaded it did not display that "Hello World" message.
+This message is actually written to the system log.
+<code bash>
+tail /var/log/syslog
+</code>
+returns:
+<code bash>
+Dec 14 17:05:19 peter-bigmamba kernel: [74429.517770] Hello, world
+</code>
+----
+===== Remove the module =====
+<code bash>
+sudo rmmod hello.ko
+</code>
+----